President Donald Trump seems to have learned the lesson painfully gleaned by all his 21st-century predecessors: You can’t reset US relations with Vladimir Putin.

It’s never easy to tell which flip or flop the flip-flopper in the White House means.

A week ago today, Trump had an hourlong phone call with Russian President Vladimir Putin. And after that, everything changed. The end of the affair: The U.S. president — who in January came into office claiming he could strike a peace deal with Putin on Day One;