South Korea concerned about Russia-North Korea military cooperation

North Korea's leader Kim Jong Un (center R) and Russia's President Vladimir Putin (center L) visiting the Vostochny Cosmodrome in Russia's Amur region. [AFP]

South Korea has expressed regret that Russia and North Korea discussed military cooperation during their leaders' meeting, as Seoul is closely monitoring the possibility of joint military drills between Pyongyang and Moscow.

Officials said South Korean President Yoon Suk Yeol will use his address next week at the United Nations General Assembly to stress grave concern over the military cooperation between North Korea and Russia.