Pat Buchanan Since calling Putin a killer, Biden has progressed to calling him “a war criminal,” “a murderous dictator,” “a pure thug” and “a butcher.” It is difficult to recall an American president using such a string of epithets about the leader of a nation with which we were not at war. Several weeks into the war in Ukraine, ABC’s George Stephanopoulos asked President Joe Biden if he agreed with those who call Russian President Vladimir Putin “a killer.” “I do,” said Biden. Since calling Putin a killer, Biden has…