Europe (OSCE)), and also became a member of the North Atlantic Cooperation Council. Ukraine–NATO relations are close and the country has declared interest in eventual membership. Ukraine is the most active member of the Partnership for Peace (PfP). All major political parties in Ukraine support full eventual integration into the European Union. The Association Agreement between Ukraine and the European Union was signed in 2014. Ukraine long had close ties with all its neighbours, but Russia–Ukraine relations rapidly deteriorated in 2014 due to the annexation of Crimea, energy dependence and payment disputes. The Deep and Comprehensive Free Trade Area (DCFTA), which entered into force in January 2016 following the ratification of the Ukraine–European Union Association Agreement, formally integrates Ukraine into the European Single Market and the European Economic Area. Ukraine receives further support and assistance for its EU-accession aspirations from the International Visegrád Fund of the Visegrád Group that consists of Central European EU members the Czech Republic, Poland, Hungary and Slovakia. In 2020, in Lublin, Lithuania, Poland and Ukraine created the Lublin Triangle initiative, which aims to create further cooperation between the three historical countries of the Polish–Lithuanian Commonwealth and further Ukraine's integration and accession to the EU and NATO. In 2021, the Association Trio was formed by signing a joint memorandum between the Foreign Ministers of Georgia, Moldova and Ukraine. The Association Trio is a tripartite format for enhanced cooperation, coordination, and dialogue between the three countries (that have signed the Association Agreement with the EU) with the European Union on issues of common interest related to European integration, enhancing cooperation within the framework of the Eastern Partnership, and committing to the prospect of joining the European Union. As of 2021, Ukraine was preparing to formally apply for EU membership in 2024, in order to join the European Union in the 2030s, however, with the Russian invasion of Ukraine in 2022, Ukrainian president Volodymyr Zelenskyy requested that the country be admitted to the EU immediately. Candidate status was granted on 23 June 2022. Military After the dissolution of the Soviet Union, Ukraine inherited a 780,000-man military force on its territory, equipped with the third-largest nuclear weapons arsenal in the world. In 1992, Ukraine signed the Lisbon Protocol in which the country agreed to give up all nuclear weapons to Russia for disposal and to join the Nuclear Non-Proliferation Treaty as a non-nuclear weapon state. By 1996 the country