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In page United Nations Security Council:

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The five permanent members of the Security Council were the victorious powers in World War II[4] and have maintained the world's most powerful military forces ever since. They annually topped the list of countries with the highest military expenditures.[5] In 2013, they spent over US$1 trillion combined on defence, accounting for over 55% of global military expenditures (the US alone accounting for over 35%).[5] They are also amongst the world's largest arms exporters[6] and are the only nations officially recognized as "nuclear-weapon states" under the Nuclear Non-Proliferation Treaty (NPT), though there are other states known or believed to be in possession of nuclear weapons.[citation needed]