Seoul will "keep a close eye" on North Korea's entanglement in Russia's war effort against Ukraine, and will "take active measures in stages based on levels in military cooperation between Moscow and Pyongyang," Yoon Yeocheol, South Korea's representative ...

On the one hand, the deployment of the North Korean troops seems a logical follow-up to the mutual defense treaty signed by Kim Jong-un and Vladimir Putin in Pyongyang in June. On the other hand, it raises a series of important questions.

The president said stronger ties with South Korea and Japan are working, but did not address whether President-elect Donald J. Trump would continue his approach when he takes office in January.