Delegations from all four countries are expected to be at the meeting, which comes after the countries spoke in Paris last week. The four countries are working to arrange a permanent ceasefire between Russia and Ukraine.
The deal includes promises that neither side will provide assistance to a third party involved in military conflict with the other, meaning Iran cannot help Ukraine while it is fighting Russia.
Russia violated Putin's self-declared truce thousands of times, says Ukrainian president, as air raids resume on Easter Monday. What we know on day 1,153 ...
President Trump says he is hopeful that Russia and Ukraine can make a deal this week after a temporary Easter ceasefire was called between the two countries.
A temporary Easter ceasefire between Ukraine and Russia expired on Sunday, as concerns grow that peace talks to end the war could collapse. NBC News' Raf Sanchez has the latest.
In a half hour burst of messages on tariffs and Ukraine, Trump kicked off an afternoon of posts on Truth Social that spilled over later into a second burst.