EXPLAINER: What's behind Russia-Ukraine tensions?

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Ukrainian and Western officials are worried that a Russian military buildup near Ukraine could signal plans by Moscow to invade its ex-Soviet neighbor. The Kremlin insists it has no such intention and has accused Ukraine and its Western backers of making the claims to cover up their own allegedly aggressive designs. Russian President Vladimir Putin has pushed for Western guarantees precluding NATO's expansion to Ukraine, and the buildup could reflect an attempt to back up the message.