Enlargement of NATO
As of 2018, NATO officially recognizes four aspiring members: Bosnia and Herzegovina, Georgia, Macedonia and Ukraine. The Federation of Bosnia and Herzegovina within Bosnia and Herzegovina has expressed willingness to join NATO, however, it faces consistent political pressure from Republika Srpska, the other political entity in the country, alongside its partners in Moscow. Macedonia has been prevented from joining the alliance by Greece, one effect of the Macedonian naming dispute. Future expansion is currently a topic of debate in several countries outside the alliance, and countries like Sweden, Finland, and Serbia have open political debate on the topic of membership, while in countries like Ukraine, support and opposition to membership is tied to ethnic and nationalist ideologies. The incorporation of countries formerly part of the Eastern Bloc and the Soviet Union has been a cause of increased tension between NATO countries and Russia.
Foreign relations of NATO
According to a NATO diplomatic source in August 2009 some key officials at NATO headquarters in Brussels were pushing hard for engaging Azerbaijan on the membership question. "Turkey, Romania, Italy, Poland, the United Kingdom and the Baltic states" are among the members backing a fast track for Azerbaijan's NATO membership. While President Ilham Aliyev has generally supported non-belligerency (though not neutrality due to the unresolved conflict with Armenia over Nagorno-Karabakh) since his rise to power in 2003, Azerbaijan has hosted NATO military exercises and high-profile meetings in 2009. The unresolved conflict over Nagorno-Karabakh would present a major roadblock to membership. Azerbaijan made its policy of not being aligned with a geopolitical/military structure official when it became a full member of the Non-Aligned Movement in 2011.