In the calls, which Ukrainian spies said they intercepted, Russian soldiers complain that "we all work like translators now."

The U.S. has assessed a “small number” of North Korean troops are present in Russia’s Kursk border region, with fears they could soon join the fight in Ukraine, the Pentagon’s top

The Pentagon said Tuesday that about 10,000 North Korean troops had been sent to Russia, in addition to a couple thousand soldiers who were already in the Kursk region.