U.S. President Donald Trump said on Tuesday he hoped Russia's Vladimir Putin would move forward on ending the war in Ukraine but conceded that the Kremlin leader may not want to make a deal at all, adding this would create a "rough situation" for Putin, Reuters reported.

In an interview with the Fox News "Fox & Friends" programme, Trump said he believed Putin's course of action would become clear in the next couple of weeks. Trump again ruled out American boots on the ground in Ukraine and gave no specifics about the security guarantees he has previously said Washington could offer Kyiv under any post-war settlement.

"I don't think it's going to be a problem (reaching a peace deal), to be honest with you. I think Putin is tired of it. I think they're all tired of it, but you never know," Trump said.

"We're going to find out about President Putin in the next couple of weeks ... It's possible that he doesn't want to make a deal," said Trump, who has previously threatened more sanctions on Russia and nations that buy its oil if Putin does not make peace, according to Reuters.