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On 29 March 2004, Slovenia became a NATO member after having deposited, in Washington, the Instrument of Accession to the North Atlantic Treaty.


1993 - The National Assembly of the Republic of Slovenia adopts the Resolution on the Starting-Points for a National Security Plan.


1994 - The democratically expressed political will for Slovenia to join NATO is first clearly expressed in the supplements to the Resolution on the Starting-Points for a National Security Plan, adopted in Slovenia’s National Assembly in January. On the basis of the decision made by the Slovenian parliament, on 30 March Slovenia becomes one of the first countries to be included in the Partnership for Peace (PfP), and, later the same year, an associate member country of the North Atlantic Assembly (NAA).


1995 - Slovenia begins to carry out the first cycle of the Planning and Review Process (PARP). In this annual process, each country presents its national defence policy and planning, decides on its participation in peace-keeping and humanitarian operations and defines its policy for deterring the proliferation of weapons of mass destruction. In 1995, Slovenia delivers its first Individual Partnership Programme. In August, members of the Slovenian Armed Forces take part in a PfP exercise in the United States (Cooperative Nugget) for the first time. In 1995, the Status of Forces and Transit Agreement for IFOR/SFOR is signed.


1996 - At the end of January, Slovenia becomes a full member of the North Atlantic Cooperation Council (NACC). Slovenia’s political decision in favour of NATO membership is clearly expressed in the National Assembly’s decision of 11 April: the Republic of Slovenia wishes to guarantee its basic security interest within the framework of a system of collective defence, made possible by NATO membership. Slovenia is among the first partner countries to respond to the Atlantic Alliance’s proposal for individual dialogue, which begins on 17 April. In three rounds of individual dialogue, Slovenia makes a comprehensive presentation of its political, economic and defence structures.


1997 - In April, the National Assembly adopts the Declaration on NATO Membership. In August, President Milan Kučan signs the order establishing the Mission of the Republic of Slovenia to NATO. Then in October, Slovenia assigns members of the Slovenian Armed Forces to SFOR.


1998 – In February, the Government presents the National Strategy for the Accession of the Republic of Slovenia to NATO. In October, Slovenia opens its airspace for overflights of NATO aircraft. The largest exercise outside NATO territory involving NATO and Partner countries takes place in Slovenia in October – Cooperative Adventure Exchange '98 (more than 6,000 soldiers from NATO and Partner countries participate).


1999 – NATO member countries adopt the Membership Action Plan (MAP) at the Washington Summit in April. Slovenia adopts the Annual National Programme of the Republic of Slovenia for the Implementation of the NATO Membership Action Plan (ANP MAP 1999–2000) in October, thus joining the process of the Membership Action Plan.


2000 – In April, a NATO research workshop takes place in Slovenia. The first cycle of the 1999–2000 Membership Action Plan concludes in May with a meeting between the North Atlantic Council and Slovenia. Slovenia for the second time presents its activities and the goals it decided to achieve, as well as the methods and target dates for reaching them in the 2000–2001 Annual National Programme.


2001 – Slovenia draws up its third ANP for the period 2001–2002, which the Government adopts in September and submits to NATO’s International Secretariat in October.


2002 – In September, Slovenia submits its fourth ANP MAP for the period 2002–2003. At the NATO Summit Meeting in Prague on 21 and 22 November, Slovenia is invited to begin accession talks for NATO membership along with Bulgaria, Estonia, Latvia, Lithuania, Romania and Slovakia. On 26 November, the Government of the Republic of Slovenia receives a formal written invitation from the NATO Secretary General to begin accession talks, and, on 24 December, adopts the starting points for accession talks with NATO.


2003 – Accession talks with NATO are held in two rounds (21 and 31 January). The Government of the Republic of Slovenia adopts the Initiative for Accession to the North Atlantic Treaty on 23 January. Slovenian NATO membership is supported by 66.08% of voters at a referendum held on 23 March. The protocol on Slovenia’s accession to NATO is signed by the Permanent Representatives of the nineteen NATO member countries in Brussels on 26 March. Slovenia’s fifth Annual National Programme for the Implementation of the Membership Action Plan (MAP) for the period 2003–2004 is submitted to NATO on 15 October.


2004 – On 24 February, the Slovenian National Assembly adopts the Act ratifying the North Atlantic Treaty, and on 29 March Slovenia deposits its instrument of accession with the depositary (the US), thus becoming a NATO member. Slovenian troops join the ISAF mission in Afghanistan in March.