In a rare move, the leader of North Korea, Kim Jong-un, traveled outside his country this week to meet with the Russian president, Vladimir V. Putin. Julian Barnes, a national security reporter for The New York Times, explains what Russia wants from North Korea and how far Mr. Putin might go to get it.Guest: Julian E. Barnes, a national security reporter for The New York Times.Background reading: 

• Kim Jong-un has ammunition stocks that Russia covets as it continues its war in Ukraine, and North Korea may get advanced technology and badly needed food aid in return.
• Heading to Russia to meet with President Vladimir V. Putin, the North Korean leader chose to travel by rail, on a train with some unusual features.

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