Ukraine crisis updates: What to know as tensions rise

Russia has placed more than 100,000 troops near Ukraine’s border and ratcheted up war games in the region

WARSAW, Poland -- Russia has placed more than 100,000 troops near Ukraine's border and ratcheted up war games in the region.

Moscow denies it is planning an assault, but the United States and its NATO allies fear that Russia is planning for war — and are making preparations of their own.

Here are things to know about the international tensions over Ukraine, a crisis reminiscent of the Cold War.

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