"While watching signs of North Korea-Russia military cooperation, the response measures will be taken in steps," a government source told Yonhap.

Seoul’s spy agency said Friday that Pyongyang sent a ’large-scale’ troop deployment to help its ally, claiming that 1,500 special forces were already training in Russia’s Far East and ready to head so

South Korea, Japan and the U.S. are rushing to address the high possibility of Pyongyang sending combat troops to fight alongside Russia in Ukraine.