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, in a letter to North Korean leader Kim Jong Un, thanked North Korea for its support and assistance in the war against Ukraine, calling the cooperation between the countries a strategic partnership,

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,