The Adriatic Charter was signed on 2 May 2003 in
Tirana under the aegis of the
United States. The role of the United States has caused some confusion; in discussions in the other member states, the Charter is often called the U.S.-Adriatic Charter. In September 2008
Montenegro and
Bosnia and Herzegovina were invited to join the Charter and joined on 4 December 2008.
Serbia accepted observer status at the same time. On 1 April 2009, Albania and Croatia became the first of the group to join NATO. On 5 June 2017, Montenegro joined NATO. On 27 March 2020, North Macedonia joined NATO. ==Members==