<Li> Belarus had 81 single warhead missiles stationed on its territory after the Soviet Union collapsed in 1991 . They were all transferred to Russia by 1996 . In May 1992, Belarus acceded to the Nuclear Non-Proliferation Treaty . </Li> <Li> Kazakhstan inherited 1,400 nuclear weapons from the Soviet Union, and transferred them all to Russia by 1995 . Kazakhstan has since acceded to the Nuclear Non-Proliferation Treaty . </Li> <Li> Ukraine has acceded to the Nuclear Non-Proliferation Treaty . Ukraine inherited about 5,000 nuclear weapons when it became independent from the Soviet Union in 1991, making its nuclear arsenal the third - largest in the world . By 1996, Ukraine had agreed to dispose of all nuclear weapons within its territory, with the condition that its borders were respected, as part of the Budapest Memorandum on Security Assurances . The warheads were disassembled in Russia . Despite Russia's subsequent and internationally disputed annexation of Crimea in 2014, Ukraine reaffirmed its 1994 decision to accede to the Nuclear Non-Proliferation Treaty as a non-nuclear - weapon state . </Li>

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