North Korea has deployed additional troops to Russia, but the scale of the contingent was not immediately known, South Korean media reported on Thursday, citing the country's intelligence agency. The additional troops have been sent to the battlegrounds in Russia's Kursk region,

Ukrainian troops holding positions in Kursk say the North Koreans have reappeared on the battlefield and become even more formidable foes.

North Korea has been supplying a vast number of conventional weapons to Russia, and last fall it sent 10,000 to 12,000 troops to Russia, according to U.S., South Korean and Ukraine intelligence officials.