KIEV Ukrainian President Volodymyr Zelensky on Friday said Russia could send North Korean troops into battle as early as Sunday and urged international pressure on the Kremlin and Pyongyang. "According to intelligence reports, on Oct. 27-28 , Russia will use the first North Korean military in combat zones," the Ukrainian leader said on social media, calling for "tangible pressure" to be placed on Russia and North Korea. North Korea — with whom Russia signed a mutual defence pact — is already