Ukraine launched a new offensive in Russia's Kursk region Sunday, Moscow and Kyiv said. Ukrainian forces had captured about 500 square miles of the western Russian province in a surprise incursion in August, but Russian and North Korean troops are believed to have retaken 40-50% of that area.

In a short post on Telegram, Andrii Yermak, the head of Ukraine's presidential office, said: "Kursk, good news, Russia is getting what it deserves."