At the height of the campaign, Ukrainian forces controlled some 500 square miles of Russian territory. Now they hold just a small sliver of land along the border.

President Volodymyr Zelensky said that Ukrainian troops have not been encircled by Russian forces in Kursk region, accusing Russian leader Vladimir Putin of “lying” about the situation on the ground.

Russia battled on Sunday to drive the last Ukrainian soldiers from western Russia, Russian officials said, after a seven-month incursion by Ukraine that aimed to distract Moscow's forces, gain a bargaining chip and rile President Vladimir Putin.