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.

Russian forces continue their offensive in the Kursk region. According to the General Staff of the Ukrainian Armed Forces, the buffer zone controlled by Ukraine's Defense Forces continues to shrink, according to the General Staff of the Ukrainian Armed Forces.

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.