12.South Korea's national security advisor Shin Won-sik on Nov. 22 said Moscow had provided Pyongyang with economic and military technology in exchange for the troops."It is understood that North Korea has been provided with related equipment and anti-aircraft missiles to strengthen Pyongyang's weak air defense system," Shin said in an interview with South Korea’s SBS News.Elsewhere, the BBC on Nov. 22 reported that Russia is estimated to have supplied North Korea with more than a million barrels of oil since March this year.The claim was based on an analysis of satellite imagery by the Open Source Centre, a non-profit research group based in the U.K.U.K. Foreign Secretary David Lammy told the BBC that the oil is payment for weapons and troops sent to Moscow to fuel the war in Ukraine.North Korean leader Kim and Russian President Vladimir Putin signed a strategic partnership agreement in June.