US President Donald Trump has said that he has received some "good news" regarding the conflict in Ukraine.

In a rare political speech at the department's Washington headquarters, Trump said: "We have had some very good calls today with Russia and with Ukraine. They've agreed for a ceasefire if we can get it with Russia.

"And it's not easy. It's a tough one, but I think we're doing it. And as the secretary general said yesterday of NATO, a terrific guy, he said without Trump, we wouldn't be talking about it. It would just go on for years."