U.S. President Donald Trump said he plans to speak to Russian President Vladimir Putin on Tuesday and discuss ending the war in Ukraine, after positive talks between U.S. and Russian officials in Moscow.

“We want to see if we can bring that war to an end,” Trump told reporters on Air Force One during a flight back to the Washington area from Florida: “Maybe we can, maybe we can’t, but I think we have a very good chance.

“I’ll be speaking to President Putin on Tuesday. A lot of work’s been done over the weekend.”

Trump is trying to win Putin’s support for a 30-day ceasefire proposal that Ukraine accepted last week, as both sides continued trading heavy aerial strikes through the weekend and Russia moved closer to ejecting Ukrainian forces from their months-old foothold in the western Russian region of Kursk.

When asked about what concessions are being considered in ceasefire negotiations, Trump said: “We’ll be talking about land. We’ll be talking about power plants…We’re already talking about that, dividing up certain assets.”

Trump did not elaborate but was most likely referring to the Russian-occupied Zaporizhzhia facility in Ukraine, Europe’s largest nuclear plant. Russia and Ukraine have accused each other of risking an accident at the plant with their actions.