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.
United Kingdom
The UK is a permanent member of the United Nations Security Council, a member of NATO, the Commonwealth of Nations, the G7 finance ministers, the G7 forum (previously the "G8 forum"), the G20, the OECD, the WTO, the Council of Europe and the OSCE. It is also a member state of the European Union in the process of withdrawal. The UK is said to have a "Special Relationship" with the United States and a close partnership with France—the "Entente cordiale"—and shares nuclear weapons technology with both countries; the Anglo-Portuguese Alliance is considered to be the oldest currently binding military alliance in the world. The UK is also closely linked with the Republic of Ireland; the two countries share a Common Travel Area and co-operate through the British-Irish Intergovernmental Conference and the British-Irish Council. Britain's global presence and influence is further amplified through its trading relations, foreign investments, official development assistance and military engagements. Canada, Australia and New Zealand are the most favourably viewed countries in the world by British people, sharing a number of close diplomatic, military and cultural ties with the UK. There is considerable public and political support for increased trade, foreign policy co-operation and mobility of citizens between the UK and Canada, Australia and New Zealand under a proposal known by the acronym "CANZUK" – with 68% of British people stating that they would endorse the proposition in principle.