WASHINGTON — As President Biden tries to forge a united allied response to Russian aggression in Ukraine, unity on the home front is strained by a Republican Party torn between traditional hawks in the leadership and a wing still loyal to Donald J. Trump’s isolationist instincts and pro-Russian sentiment.

Republican leaders, by and large, have struck an aggressive posture, encouraging Mr. Biden to get tougher on Russia, through immediate sanctions on Russian energy exports and more lethal aid to Ukraine’s military. But that message has been undermined by the party’s far right, which has questioned why the United States would […]

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By Donato