By Matt Spetalnick, Simon Lewis and Steve Holland WASHINGTON (Reuters) – He threatened to impose the harshest sanctions ever on Russia. He worked to galvanize U.S. allies into a united front. He supplied Ukraine with more weapons than any American president before him. And he beefed up U.S. forces on NATO’s eastern flank as reassurance of his commitment. Despite U.S. President Joe Biden’s efforts to head off a Russian attack against Ukraine, President Vladimir Putin was undeterred. On Thursday, he authorized what he called a “special military operation” into the Donbass region of eastern Ukrai…

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