President Donald Trump spoke with both Russian President Vladimir Putin and Ukrainian President Volodymyr Zelenskyy and other leaders in separate calls Monday, in an attempt to stop the “bloodbath” of the war in Ukraine.

But the president’s outreach was inconclusive, and there was little sign of a breakthrough. Russia and Ukraine would hold direct talks on a ceasefire “immediately,” Trump said afterward in a post on his social network Truth Social, but it was unclear what form those talks would take or when they would happen. The Vatican, Trump said, has expressed interest in hosting the negotiations.

“The conditions for that will be negotiated between the two parties, as it can only be, because they know details of a negotiation that nobody else would be aware of,” he said.

Trump’s call with Putin lasted more than two hours and “was very informative and very open,” Putin told Russian state media.