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Ukraine Gave Up Nuclear Arms in 1994 Deal Russia Flouts

For a brief period, Ukraine was the world’s third-largest nuclear power.

It gave up thousands of nuclear warheads inherited from the Soviet Union in return for a 1994 promise from the U.S. and Russia not to use force or threaten military action against the newly independent nation, a pledge Russian President Vladimir Putin repudiated yesterday after his troops took control of Ukraine’s Crimea peninsula.