President Yun: ``Military cooperation between Russia and North Korea is a violation of Security Council resolutions.'' ``In the event of a North Korean nuclear attack, the United States and South Korea would respond overwhelmingly.''

South Korean President Yoon Seo-gyeol said on the 17th, ``Military cooperation between North Korea and Russia is an illegal and unjust act that violates United Nations Security Council resolutions and various international sanctions.'' ``The international community must respond accordingly.''