The State Union of Serbia and Montenegro applied to NATO's Partnership for Peace (PfP) program in June 2003. Montenegro declared independence on 3 June 2006 and soon after opened a Permanent Mission to NATO in Brussels. The new country subsequently joined PfP at the 2006 Riga summit. In November 2007, Montenegro signed a transit agreement with NATO, allowing the alliance's troops to move across the country. Montenegro then signed an agreement with the United States, in which Montenegro would destroy its outdated weaponry as a precondition for NATO membership. In late 2007, Montenegro's Defense Minister Boro Vučinić said that Montenegro would intensify its accession to the alliance after the 2008 Bucharest summit. Montenegro entered Intensified Dialogue with NATO in April 2008, and adopted an Individual Partnership Action Plan in June 2008. It was invited to join the Adriatic Charter of NATO aspirants on 25 September 2008. The country then applied for a Membership Action Plan on 5 November 2008 with support of Prime Minister Milo Đukanović, which was granted in December 2009. Montenegro also began full membership with the Adriatic Charter of NATO aspirants in May 2009.