Russia on Wednesday freed an American who had been jailed for more than four years on charges of fighting as a mercenary in Ukraine, a deal completed during a visit by a top US envoy and at a time when President Donald Trump has taken a series of actions meant to benefit Moscow. Trump told reporters at the White House that he had asked Russian President Vladimir Putin during a recent call to free Stephen Hubbard and that, unlike previous releases, the US did not have to give up anyone in return.