US President Donald Trump struck a hopeful note on his social media platform Truth Social last night, saying that 'hopefully Russia and Ukraine will make a deal this week'.
Ukraine's Elina Svitolina won her first title in nearly two years after beating Serbian Olga Danilovic 6-4, 7-6(8) in the Rouen Open final in France on Sunday.
Ukrainian and Russian officials accused each other of violating a truce that was supposed to halt the military conflict during the Easter holiday on Sunday.
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.