In certain cases, a ''chargé d'affaires
may be appointed for long periods, such as when a mission is headed by a non-resident ambassador who is accredited to multiple countries. In addition, a mission may be downgraded from an ambassadorial to a chargé d'affaires
level to show displeasure, yet avoid taking the extremely serious step of breaking diplomatic relations. For example, Saudi Arabia and Thailand did not exchange ambassadors between 1989 and 2022, due to the Blue Diamond Affair. The Holy See recalled the ambassador to Taipei right after United Nations General Assembly Resolution 2758 ceased to recognize the Republic of China as the sole legitimate representative of China, and thus chargé d'affaires'' becomes the most top-ranked de facto envoy to
Taipei since then (the ambassador did not leave his position until 1979). Sometimes when diplomatic recognition is extended to a new government, a
chargé may be sent to immediately establish diplomatic representation. However, if a timely exchange of ambassadors does not take place, this may result in a prolonged period of
chargé-level relations. For example, the United Kingdom recognized the
People's Republic of China in 1950 and posted a ''chargé d'affaires'' in the new capital of
Beijing. However, China was unwilling to exchange ambassadors until the United Kingdom withdrew its consulate from
Taipei.
Sino-British relations were not upgraded to the ambassadorial level until 1972. Since a ''chargé d'affaires
presents his or her credentials to the foreign minister rather than the head of state, the appointment of a chargé
may avoid a politically sensitive meeting that would imply approval or recognition of that head of state or government. Similarly, the receiving country may decline to receive an ambassador, but still maintain diplomatic relations by accepting a chargé
. For example, the Republic of Cyprus appoints a number of chargés d'affaires
en pied'' to its embassies abroad. == History ==