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.For more information on today’s episode, visit nytimes.com/thedaily. Transcripts of each episode will be made available by the next workday.