MOSCOW (Reuters) - The positions of Moscow and Seoul on North Korea have moved closer after a meeting of the Russian and South Korean presidents, RIA news agency cited Kremlin aide Yuri Ushakov as saying on Wednesday. Russian President Vladimir Putin met South Korea s Moon Jae-in on the sidelines of an economic summit in the eastern Russian city of Vladivostok on Wednesday amid mounting international concern that Pyongyang plans more weapons tests. 