Putin's embrace of Kim Jong Un has its limits

Derek Grossman is a senior defense analyst at the think tank RAND Corp. in Santa Monica, California, and an adjunct professor in the practice of political science and international relations at the University of Southern California. He formerly served as an intelligence adviser at the Pentagon.

Alexander Matsegora, Russia's ambassador to North Korea, has predicted that this will be a "breakthrough year" for the partnership between the two countries.