NAVO: Enlargement and Article 10

NATO's "open door policy" is based upon Article 10 of the Washington Treaty … 1 April 2009: Accession of Albania and Croatia

NATO's "open door policy" is based upon Article 10 of the Washington Treaty … 9 July 2008: Accession Protocols for Albania and Croatia are signed.

NATO's "open door policy" is based upon Article 10 of the Washington Treaty … 2-4 April 2008: At the Bucharest Summit, Allied Leaders invite Albania and Croatia to start accession talks

NATO's "open door policy" is based upon Article 10 of the Washington Treaty … 29 March 2004: Accession of Bulgaria, Estonia, Latvia, Lithuania, Romania, Slovakia and Slovenia.

NATO's "open door policy" is based upon Article 10 of the Washington Treaty … 21-22 November 2002: At the Prague Summit, seven partner countries – Bulgaria, Estonia, Latvia, Lithuania, Romania, Slovakia and Slovenia – are invited to start accession talks. 26 March 2003: Signing ceremony of the Accession Protocols of the seven invitees.

NATO's "open door policy" is based upon Article 10 of the Washington Treaty … 21-22 November 2002: At the Prague Summit, seven partner countries – Bulgaria, Estonia, Latvia, Lithuania, Romania, Slovakia and Slovenia – are invited to start accession talks.

NATO's "open door policy" is based upon Article 10 of the Washington Treaty … 6 May 1955: Accession of the Federal Republic of Germany

NATO's "open door policy" is based upon Article 10 of the Washington Treaty … 4 April 2023: Accession of Finland

NATO's "open door policy" is based upon Article 10 of the Washington Treaty … 5 July 2022: Allies sign the Accession Protocols for Finland and Sweden, making them official Invitees.

NATO's "open door policy" is based upon Article 10 of the Washington Treaty … 29-30 June 2022: Heads of State and Government from Finland, Georgia, Sweden and Ukraine and the Defence Minister of Bosnia and Herzegovina take part in the NATO Summit in Madrid. NATO reaffirms its commitment to its "open door policy", formally inviting Finland and Sweden to become members of NATO

NATO's "open door policy" is based upon Article 10 of the Washington Treaty … 18 February 1952: Accession of Greece and Türkiye

NATO's "open door policy" is based upon Article 10 of the Washington Treaty … 5 June 2017: Accession of Montenegro

NATO's "open door policy" is based upon Article 10 of the Washington Treaty … 19 May 2016: Allied ministers sign the Accession Protocol, following which Montenegro has 'Invitee' status and starts attending North Atlantic Council and other NATO meetings.

NATO's "open door policy" is based upon Article 10 of the Washington Treaty … 2 December 2015: NATO Foreign Ministers meeting in Brussels invite Montenegro to start accession talks to join the Alliance, while encouraging further progress on reforms, especially in the area of rule of law.

NATO's "open door policy" is based upon Article 10 of the Washington Treaty … 27 March 2020: Accession of the Republic of North Macedonia

NATO's "open door policy" is based upon Article 10 of the Washington Treaty … 6 February 2019: The Allies sign the Accession Protocol of the Republic of North Macedonia, following which the country takes part in NATO activities as an invitee.

NATO's "open door policy" is based upon Article 10 of the Washington Treaty … 11 July 2018: At the Brussels Summit, following the historic agreement between Athens and Skopje on the solution of the name issue, Allied leaders invite the government in Skopje to begin accession talks to join NATO.