Russian President Vladimir Putin warns that he won't hesitate to use nuclear weapons to ward off Ukraine's attempt to reclaim control of Moscow-occupied areas that the Kremlin is about to annex.While the West dismisses that as a scare tactic, a top Putin lieutenant upped the ante by boldly saying the US and its NATO allies wouldn't dare strike Russia, even if it used nuclear weapons in Ukraine.How serious is Putin? Here' are the key questions around the the issue.
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