The Soviet Union was the primary ideological adversary for NATO during the Cold War. Following its dissolution, several states which had maintained
neutrality during the Cold War or were
post-Soviet states increased their ties with Western institutions; a number of them requested to join NATO. The 2022 Russian invasion of Ukraine reignited debate surrounding NATO membership in several countries.
Austria,
Ireland,
Switzerland, and
Malta have maintained their Cold War–era neutrality. All are now members of the
Partnership for Peace, and all except Switzerland are now members of the
European Union. The defence ministry of Switzerland, which has a
long-standing policy of neutrality, initiated a report in May 2022 analyzing various military options, including increased cooperation and joint military exercises with NATO. That month, a poll indicated 33% of Swiss supported NATO membership for Switzerland, and 56% supported increased ties with NATO.
Cyprus is also a
member state of the European Union, but it is the only one that is neither a full member state nor participates in the Partnership for Peace. Any treaty concerning Cyprus' participation in NATO would likely be blocked by
Turkey because of the
Cyprus dispute.
Russia,
Armenia,
Belarus, and
Kazakhstan are all members of the
Collective Security Treaty Organization (CSTO), a post-Soviet alternative military alliance.
Azerbaijan was a member of the CSTO but has committed to a policy of neutrality since 1999. In 2000, Russian President
Vladimir Putin floated the idea of Russia potentially joining NATO. However these prospects went nowhere, and Putin began developing anti-NATO sentiment and espousing hostile views towards NATO from the early 2000s. In 2009, Russian envoy
Dmitry Rogozin did not rule out joining NATO at some point, but stated that Russia was currently more interested in leading a coalition as a
great power.
Armenia Armenia regained its independence from the
Soviet Union in 1991. Since then, Armenia has pursued developing closer
Euro-Atlantic ties with the
member states of NATO. Armenia joined the North Atlantic Cooperation Council in 1992, which was succeeded in 1997 by the
Euro-Atlantic Partnership Council (EAPC). The EAPC brings together
NATO allies and partner countries from the Euro-Atlantic area. On 5 October 1994, Armenia became a member of the
Partnership for Peace programme. However, several politicians and political parties have called on the
Government of Armenia to withdraw Armenia's membership in the Collective Security Treaty Organization and either seek full membership in NATO or become a
major non-NATO ally (MNNA). For example, the
European Party of Armenia, the
For The Republic Party, and the
Christian-Democratic Rebirth Party have campaigned in favor of Armenia's membership in NATO, while the
Armenian National Movement Party and the
National Democratic Pole have called for developing deeper relations with NATO. After the start of
renewed fighting between Armenia and Azerbaijan on 13 September 2022, Armenia triggered the mutual defence Article 4 of the CSTO treaty. However, the CSTO mission sent to monitor the situation along the border took a rather uncommitted position in the conflict, leading to increased criticism towards CSTO membership inside Armenian political circles, with the secretary of the
Security Council of Armenia,
Armen Grigoryan even stating that he saw no more hope for the CSTO. The lack of Russian support during the conflict prompted a national debate in Armenia, as an increasing percentage of the population put into doubt whether it is beneficial to continue CSTO membership, calling for realignment of the state with NATO instead. This coincided with a visit from
Speaker of the United States House of Representatives Nancy Pelosi to Yerevan on 17 September 2022, largely seen as an effort to reorient the security alliance structure of Armenia. The
Helsinki Citizens' Assembly presented a document of recommendations to Nancy Pelosi during her visit to Yerevan. One of the recommendations was to provide MNNA status to Armenia. On 23 November 2022, opposition protestors gathered in Yerevan, led by the
anti-Russian National Democratic Pole Alliance. Protestors called for the withdrawal of Armenia from the CSTO and for the country to develop closer relations with the
United States and
the West. Some US politicians like
Sam Brownback have also campaigned for Armenia to be granted MNNA status. On 21 June 2023, Brownback stated, "Armenia is a natural long-term ally of the United States. Armenia must be given Major Non-NATO Ally Status of the US". On 3 September 2023, during an interview, Armenian prime minister Nikol Pashinyan stated that it was a strategic mistake for Armenia to solely rely on Russia to guarantee its security. Pashinyan stated, "Moscow has been unable to deliver and is in the process of winding down its role in the wider
South Caucasus region" and "the Russian Federation cannot meet Armenia's security needs. This example should demonstrate to us that dependence on just one partner in security matters is a strategic mistake". Pashinyan accused Russian peacekeepers deployed to uphold the
ceasefire deal of failing to do their job. Pashinyan confirmed that Armenia is trying to diversify its security arrangements, most notably with the
European Union and the United States. On 23 February 2024, Armenian Prime Minister Nikol Pashinyan stated that Armenia has frozen its participation in the CSTO. Pashinyan said "We have now in practical terms frozen our participation in this treaty" and "membership of the CSTO was under review" during a live broadcast interview. On 28 February 2024, during a speech made in the
National Assembly, Pashinyan further stated that the CSTO is "a threat to the national security of Armenia". On 12 March, Pashinyan said that the CSTO needed to clarify "what constitutes Armenia's sovereign territory", as the organization had not come to Armenia's defence when requested following
Azerbaijani troops crossing the border into Armenia's internationally recognized territory. Pashinyan said that if the CSTO's response did not align with Armenia's expectations, the country would officially withdraw from the organization. On 12 June 2024, Armenia announced that it would formally withdraw from the alliance at an unspecified later date, with Pashinyan stating, "We will leave. We will decide when to exit ... Don't worry, we won't return". In May 2024, the
United Platform of Democratic Forces called on the government of Armenia to apply for EU and NATO membership. On 12 February 2025 the
Armenian parliament unanimously approved a bill to initiate
Armenia's accession process to the European Union. The Armenian government has announced that it aims to join the European Union, but does not intend to join NATO.
Austria in
Bosnia and Herzegovina.|alt= Four soldiers in green military attire walk in a line in front of a green military vehicle holding guns.
Austria was
occupied by the four victorious
Allied powers following
World War II under the
Allied Control Council, similar to
Germany. During negotiations to end the occupation, which were ongoing at the same time as Germany's, the Soviet Union insisted that the reunified country adopt the model of
Swiss neutrality. The US feared that this would encourage
West Germany to accept similar
Soviet proposals for neutrality as a condition for
German reunification. Shortly after West Germany's accession to NATO, the parties agreed to the
Austrian State Treaty in May 1955, which was largely based on the Moscow Memorandum signed the previous month between Austria and the Soviet Union. While the treaty itself did not commit Austria to neutrality, this was subsequently enshrined into Austria's constitution that October with the
Declaration of Neutrality. The Declaration prohibits Austria from joining a military alliance, from hosting foreign military bases within its borders, and from participating in a war. Membership of Austria in the
European Union (or its predecessor organizations) was controversial because of the Austrian commitment to neutrality. Austria only joined in
1995, together with Sweden and Finland, which had also declared their neutrality in the Cold War. Austria joined NATO's
Partnership for Peace in 1995, and participates in NATO's
Euro-Atlantic Partnership Council. The
Austrian military also participates in the
United Nations peacekeeping operations and has deployments in several countries , including
Kosovo,
Lebanon, and
Bosnia and Herzegovina, where it has led the
EUFOR mission there since 2009. The 2022
Russian invasion of Ukraine, and subsequent NATO membership of Finland and Sweden, did lead to additional calls to re-open the issue of neutrality, including from
Andreas Khol, the 2016 ÖVP presidential nominee. However, only the
NEOS party, which then held 15 of the 183 seats in the
National Council, supported a May 2022 open letter asking the government to review its commitment to neutrality, and Chancellor
Karl Nehammer, of the ÖVP, has rejected the idea. Membership is not widely popular with the Austrian public. A March 2023 survey found 21% in favor, with 61% against, a small increase of both 7% in favor and 7% unsure, compared to the last survey 10 months prior.
Cyprus , President of Cyprus, meeting in 2024 with his counterpart,
Keir Starmer, of the United Kingdom, which controls
two military bases on the island.|alt=Two men dressed in dark suits shake hands in front of the black door to 10 Downing Street. Prior to gaining its independence in 1960, Cyprus was a crown colony of the United Kingdom and as such the UK's NATO membership also applied to
British Cyprus. The
Sovereign Base Areas of Akrotiri and Dhekelia in Cyprus remained under British control as a
British Overseas Territory following independence. Neighbouring
Greece and Turkey competed for influence in the newly independent Cyprus, with intercommunal rivalries and movements for
union with Greece or
partition and partial union with Turkey. The first
President of the independent Republic of Cyprus (1960–1977), Archbishop of Cyprus
Makarios III, adopted a policy of non-alignment and took part in the 1961 founding meeting of the
Non-Aligned Movement in
Belgrade. The 1974
Turkish invasion of Cyprus and ongoing
dispute, in which Turkey continues to occupy
Northern Cyprus, complicates Cyprus' relations with NATO. Any treaty concerning Cyprus' participation in NATO, either as a full member, PfP or
Euro-Atlantic Partnership Council, would likely be vetoed by
Turkey, a full member of NATO, until the dispute is resolved. The
Parliament of Cyprus voted in February 2011 to apply for membership in the PfP program, but
President Demetris Christofias vetoed the decision, arguing that it would hamper his attempts to negotiate an end to the Cyprus dispute and demilitarize the island.
Nicos Anastasiades, who was
elected President in 2013, stated that he intended to apply for membership in the PfP program soon after taking over. His foreign minister
Nikos Christodoulides later dismissed Cypriot membership of NATO or Partnership for Peace, preferring to keep Cyprus'
foreign and defence affairs within the framework of the EU, i.e. the
Common Security and Defence Policy (CSDP). In May 2022, defence minister Charalambos Petrides confirmed that the country would not apply to NATO despite the
Russian invasion of Ukraine. After the
2023 presidential election, Anastasiades' foreign minister Christodoulides succeeded him as President. In November 2024, Christodoulides reversed his previous stance and revealed a plan to deepen Cyprus' relations with NATO and eventually join as a full member. Under the first phase of the plan, Cyprus would seek to join preparatory organisations linked to NATO, which would require progress in resolving the Cyprus dispute with NATO member Turkey and improvements to
EU–Turkey relations. Practical steps of the plan include securing a longer-term exemption from the U.S. arms embargo, expanding joint military training opportunities for the
Cypriot National Guard at U.S. military academies, and modernisation of Cyprus' defence infrastructure to meet NATO standards. Christodoulides stated that "the U.S. response has been very positive" and that these steps "will ensure that, once all conditions are met, Cyprus can join NATO".
Ireland ' interoperability with NATO.|alt=Male and female soldiers wearing camouflage marching behind the Irish tri-color flag.
Ireland was
neutral during World War II, though the country cooperated with Allied intelligence and permitted the Allies use of Irish airways and ports. Ireland continued its policy of
military neutrality during the Cold War, and before soldiers in the Irish military, the
Defence Forces, can be sent abroad, Irish law requires approval from the government, the
Dáil Éireann, and the
United Nations, which has been referred to as a "triple lock" on Irish neutrality since the early 2000s. Ireland supplied a small number of troops to the NATO-led
International Security Assistance Force (ISAF) in
Afghanistan (2001–2014) and supports the ongoing NATO-led
Kosovo Force (KFOR). Ireland joined NATO's
Partnership for Peace (PfP) program and
Euro-Atlantic Partnership Council (EAPC) in 1999, and participates in the alliance's PfP Planning and Review Process (PARP). This aims to increase the
interoperability of the
Defence Forces with NATO member states and bring them into line with accepted international standards so as to successfully deploy with other professional military forces on
peacekeeping operations overseas. The country most recently renewed their agreement with NATO regarding interoperability in February 2024, with the issues of cybersecurity and the security of
underseas communication cables in Irish waters being added as additional areas of cooperation. While there are a number of individual politicians who support Ireland joining NATO, mainly within the center-right
Fine Gael party, no major political party in Ireland currently supports full accession to NATO, a reflection on public opinion in the country. Though its stance was softened during the
2024 election campaign, the
republican party
Sinn Féin has long supported both withdrawal from PfP and passage of a
constitutional amendment to prohibit the country from joining a military alliance like NATO. The Dáil Éireann has considered and defeated such an amendment in April 2019 and in November 2023. While Taoiseach
Micheál Martin said in 2022 that Ireland would not need to hold a referendum in order to join NATO, Irish constitutional lawyers have pointed to the precedent set by the 1987 case
Crotty v. An Taoiseach as suggesting it would be necessary, and that any attempt to join NATO without a referendum would likely be legally challenged in the country's courts in a similar way. Former Taoiseach
Leo Varadkar has also highlighted the possibility that a
United Ireland would likely have to reconsider defense arrangements, namely those with NATO, as the six counties of
Northern Ireland are currently part of the alliance. Polling did show a rise in support for joining NATO following the February 2022
Russian invasion of Ukraine, as a March 2022 poll reported 48% supporting NATO membership and 39% opposing it, while one in August 2022 found 52% in favor of joining and 48% opposed. By June 2023, however, the numbers had returned to prior levels, with around 34% in favour and 38% opposed. Former
Secretary General of NATO Anders Fogh Rasmussen said during a visit to the country in 2013 that the "door is open" for Ireland to join NATO at any time.
Kosovo meeting with US Ambassador to NATO
Kay Bailey Hutchison at NATO Headquarters in 2017|alt=Three men and one woman in suits stand on a red carpet in front of two blue flags. According to
Minister of Foreign Affairs Enver Hoxhaj, integration with NATO is a priority for
Kosovo, which
declared independence from Serbia in 2008. Kosovo submitted an application to join the PfP program in July 2012, and Hoxhaj stated in 2014 that the country's goal is to be a NATO member by 2022. In December 2018,
Kosovar Prime Minister Ramush Haradinaj stated that Kosovo will apply for NATO membership after the formation of the
Kosovo Armed Forces. Kosovo's lack of
recognition by four
NATO member states—
Greece,
Romania,
Spain, and
Slovakia—could impede its accession. In February 2022, during the Russian invasion of Ukraine, Minister of Defense
Armend Mehaj requested a permanent US military base in the country and an accelerated accession process to the organization, citing an "immediate need to guarantee peace, security and stability in the Western Balkans".
Malta , which, like other non-NATO member European states, has generally cooperative relations with the organization.|alt=A sea-side cliff topped by a small white, spherical structure. When the North Atlantic Treaty was signed in 1949, the Mediterranean island of
Malta was a dependent territory of the United Kingdom, one of the treaty's original signatories. As such, the
Crown Colony of Malta shared the UK's international memberships, including NATO. Between 1952 and 1965, the headquarters of the
Allied Forces Mediterranean was based in the town of
Floriana, just outside Malta's capital of
Valletta. When Malta gained independence in 1964, prime minister
George Borg Olivier wanted the country to join NATO. Olivier was concerned that the presence of the NATO headquarters in Malta, without the security guarantees that NATO membership entailed, made the country a potential target. However, according to a memorandum he prepared at the time he was discouraged from formally submitting a membership application by
Deputy Secretary General of NATO James A. Roberts. It was believed that some NATO members, including the United Kingdom, were opposed to Maltese NATO membership. As a result Olivier considered alternatives, such as seeking associate membership or unilateral security guarantees from NATO, or closing the NATO headquarters in Malta in retaliation. Ultimately, Olivier supported the alliance and signed a defense agreement with the UK for use of Maltese military facilities in exchange for around £2 million a year. This friendly policy changed in 1971, when
Dom Mintoff, of the
Labour Party, was elected as prime minister. Mintoff supported
neutrality as his foreign policy, and the position was later enshrined into the country's
constitution in 1974 as an amendment to Article 1. The country joined the
Non-Aligned Movement in 1979, at the same time when the British
Royal Navy left its base at the
Malta Dockyard. In 1995, under Prime Minister
Eddie Fenech Adami of the
Nationalist Party, Malta joined the
Euro-Atlantic Partnership Council multilateral defense forum and NATO's
Partnership for Peace program. When the Labour Party regained power the following year, however, it withdrew Malta from both organizations. Though the Nationalists resumed the majority in parliament in 1998, Malta did not rejoin the EAPC and PfP programs again until 2008, after the country had joined the
European Union in 2004. Since re-joining, Malta has been building its relations with NATO and getting involved in wider projects including the PfP Planning and Review Process and the
NATO Science for Peace and Security Program. NATO membership is not supported by any of the country's political parties, including neither the governing Labour Party nor the opposition
Nationalist Party. NATO's secretary-general Jens Stoltenberg has stated that the alliance fully respects Malta's position of neutrality, and put no pressure for the country to join the alliance. A
Eurobarometer survey in May 2022 found that 75% of Maltese would however support greater military cooperation within the European Union.
Moldova (left) attending a NATO meeting in
Warsaw in 2016|alt=Two older European men in suits and ties stand in front of flags.
Moldova gained independence in 1991 following the collapse of the Soviet Union. The
country's current constitution was adopted in 1994, and forbids the country from joining a military alliance, but some politicians, such as former Moldovan Minister of Defence
Vitalie Marinuța, have suggested joining NATO as part of a larger European integration. Moldova joined NATO's
Partnership for Peace in 1994, and initiated an Individual Partnership Action Plan in 2010. Moldova also participates in NATO's peacekeeping force in Kosovo. This separatist issue could preclude Moldova from joining NATO. Moldova's President
Maia Sandu stated in January 2023 that there was "serious discussion" about joining "a larger alliance", though she did not specifically name NATO. The second largest alliance in the
parliament of Moldova, the
Electoral Bloc of Communists and Socialists, strongly opposes NATO membership. A poll in December 2018 found that, if given the choice in a referendum, 22% of Moldovans would vote in favor of joining NATO, while 32% would vote against it and 21% would be unsure. Some Moldovan politicians, including former Prime Minister
Iurie Leancă, have also supported the idea of
unifying with neighboring Romania, with which Moldova shares a language and much of its history, and a poll in April 2021 found that 43.9% of those surveyed supported that idea.
Romania is a current member of both NATO and the European Union.
Serbia |alt=A sidewalk with the words "SERBIA YES NATO NO YANKEE GO HOME!" spray painted in red.
Yugoslavia's
communist government sided with the
Eastern Bloc at the beginning of the
Cold War, but pursued a policy of
neutrality following the
Tito–Stalin split in 1948 after an initial indirect alignment with NATO via the
Balkan Pact. It was a
founding member of the Non-Aligned Movement in 1961. Since
that country's dissolution most of its
successor states have joined NATO, but the largest of them,
Serbia, has maintained neutrality. The
NATO intervention in Bosnia and Herzegovina in 1992 against
Bosnia-Serbian forces and the
NATO bombing of targets in Serbia (then part of
FR Yugoslavia) during the
Kosovo War in 1999 resulted in strained relations between Serbia and NATO. After the overthrow of President
Slobodan Milošević Serbia wanted to improve its relations with NATO, though membership in the military alliance remained highly controversial among political parties and society. In the years under Prime Minister
Zoran Đinđić the country (then
Serbia and Montenegro) did not rule out joining NATO, but after
Đinđić's assassination in 2003 Serbia increasingly started preferring a course of military neutrality.
Serbia's Parliament passed a resolution in 2007 which declared Serbia's
military neutrality until such time as a referendum could be held on the issue. Relations with NATO were further strained following
Kosovo's declaration of independence in 2008, while it was a
protectorate of the United Nations with security support from NATO. Serbia was invited to and joined NATO's
Partnership for Peace program during the
2006 Riga summit, and in 2008 was invited to enter the intensified dialog program whenever the country was ready. In April 2011 Serbia's request for an IPAP was approved by NATO, and Serbia submitted a draft IPAP in May 2013. The agreement was finalized on 15 January 2015. Serbian President
Aleksandar Vučić, in office since 2017, reiterated in March 2022 that his government was not interested in NATO membership. A poll that month suggested that 82% of Serbians opposed joining NATO, while only 10% supported the idea. The minor
Serbian Renewal Movement, which has two seats in the
National Assembly, and the
Liberal Democratic Party, which currently has none, remain the most vocal political parties in favor of NATO membership. The
Democratic Party abandoned its pro-NATO attitude, claiming the Partnership for Peace is enough. Serbia maintains
close relations with Russia, which are due to their shared stances on the Kosovo issue and popular affinity for Russia. Serbia and Belarus are the only European states that refused to impose sanctions on Russia in response to its
invasion of Ukraine. ==Other proposals ==