Ukraine shocked the world with its bold offensive operation in the summer that at its height took control of an area about the size of Los Angeles in Kursk, Russia.

By Dan Peleschuk (Reuters) -Ukrainian troops are still fending off Russian and North Korean forces in Russia's Kursk region but face a potential new attack on Ukraine's northeast Sumy region, President Volodymyr Zelenskiy said on Saturday.

Russian President Vladimir Putin has called on Ukrainian troops in the Russian region of Kursk to surrender, as diplomatic back-and-forth continues over a potential US-brokered ceasefire with Ukraine.