President Trump had a long call with Ukrainian President Volodymyr Zelensky during his flight back to Washington about his talks with Russian President Vladimir Putin, White House Press Secretary Karoline Leavett said.

It was a welcome tailored for a close friend, not a war criminal, and it looked to the Ukrainians like their nightmare.

The US president said a peace agreement would be better than a "mere" ceasefire, hours after summit with Putin that produced little.