U.S. President Donald Trumpis expected to speak with his Russian counterpart Vladimir Putinthis week on ways to end the three-year war in Ukraine, U.S. envoy Steve Witkoff told CNN on Sunday after returning from what he described as a "positive" meeting with Putin in Moscow.

Russia and Ukraine have traded heavy aerial blows with both sides reporting more than 100 enemy drones over their respective territories overnight.

The Kremlin is pressing an offensive to take back its land in the Kursk region, while prolonging negotiations over a proposal by Washington and Kyiv.