A timeline of the complicated relations between Russia and North Korea

By KIM TONG-HYUNG
Associated Press

SEOUL, South Korea (AP) — North Korean leader Kim Jong Un has arrived in Russia to see President Vladimir Putin. It will be the two isolated leaders’ second meeting. Their governments have not confirmed an agenda, but U.S. officials say Putin may ask for artillery and other ammunition for his war in Ukraine. Such a request would mark a reversal of roles from the 1950-53 Korean War, when the Soviet Union provided ammunition, warplanes and pilots to support communist North Korea’s invasion of the South, and the decades of Soviet sponsorship of the North that followed. Despite their often aligning interests, relations between Russia and North Korea have experiencing highs and lows.