Seoul Defence Ministry Believes N. Korea's Kim Entered Russia Tuesday

South Korea's defence ministry said it believed that Pyongyang's leader Kim Jong Un entered Russia early Tuesday on his heavily armoured private train, ahead of a meeting with President Vladimir Putin.

"The Ministry of National Defense believes that North Korea's Kim Jong Un entered Russia early this morning using a private train," it said, after the North's state media and the Kremlin confirmed Kim's trip, his first out of the country in four years.