A “window for peace is opening” in Ukraine, China’s top diplomat told a meeting of G20 foreign ministers on Thursday, as the Trump administration ramps up its push to end the war in close coordination with Russia.

Russia and the United States have had their first meeting since the start of the Ukraine war, aimed at restoring relations and preparing the ground for ending the conflict.

A look at how the war in Ukraine began, the state of the peace talks and why the country isn’t holding elections.