Ukrainian forces have said they have accepted the surrender of the largest single group of Russian soldiers since the start of the war more than two years ago, as Kyiv¡¯s military claimed to continue expanding its cross-border incursion.

A Ukrainian Security Service unit operating in Russia¡¯s Kursk region took 102 Russian servicemen as prisoners-of-war, according to a person with knowledge of the operation, who asked not to be identified because the matter is sensitive.

The Russians were captured Wednesday in a sprawling underground complex, and had ample stocks of ammunition and supplies, the person said. Russia hasn¡¯t commented.