Ukraine crisis updates: What to know as tensions rise

The United States and NATO have made no concessions to the main Russian demands to resolve the crisis over Ukraine

WARSAW, Poland -- The United States and NATO have made no concessions to the main Russian demands to resolve the crisis over Ukraine, including giving Moscow a guarantee that its western neighbor can never join the alliance.

The focus is now on how Russia will respond — a decision that rests squarely with President Vladimir Putin and one that could determine whether Europe will again be plunged into war.

Here are things to know on Thursday about the international tensions surrounding Ukraine.

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