Russian President Vladimir Putin and North Korea's leader Kim Jong Un have vowed to strengthen cooperation, days ahead of Putin's summit in Alaska with Donald Trump, Pyongyang's state media reported Wednesday.

Russian President Vladimir Putin hailed North Korean troops sent to fight in Ukraine as "heroic" in a letter to Kim Jong Un, North Korean state media reported Friday.- 'Excellent soldiers' - The letter from Putin came alongside a visit by a Russian delegation to Pyongyang,

During the call with North Korean leader Kim Jong Un, Russian President Vladimir Putin praised the “bravery” of North Korean troops who fought with Russia against Ukraine.