Trump wants Russia and Ukraine to freeze the war on the current battlelines, with Moscow holding a huge swathe of eastern Ukraine.

Russia rejects Trump's plan to halt Ukraine conflict at current battle lines, with Moscow demanding full control of Donbas region for lasting peace agreement.

Donald Trump has said he would like China's help to deal with Russia as he seeks to bring an end to the war in Ukraine. "I'd like China to help us out with Russia," the US president said on board Air Force One, as he flew to Asia for a whirlwind tour, where he will meet China's Xi Jinping in South Korea.

A summit between Donald Trump and Vladimir Putin to end the war in Ukraine has been cancelled, the White House confirmed on Tuesday. The US and Russian leaders had been expected to meet in Budapest, Hungary, in the coming weeks for further talks on ending the war.

It could be the political meeting of the year. President Donald Trump is Japan, days before he is to meet China's Xi Jinping in South Korea on Thursday. Trump said Monday that "I really feel good" about reaching a deal with China.

The U.S. and China have agreed to a framework of a deal ahead of Thursday's meeting between President Trump and Chinese leader Xi Jinping. CBS News' Willie James Inman and Sam Vinograd have more.