Russian Foreign Minister Sergey Lavrov, center right, shakes hands with North Korean Vice Foreign Minister Sin Hong Chol on his arrival at Pyongyang Airport, North Korea Thursday, May 31, 2018. Lavrov's visit comes ahead of a planned summit between President Donald Trump and North Korean leader Kim Jong Un and is seen as an attempt by Moscow to ensure its voice is heard in the North's diplomatic overtures with Washington, Seoul and Beijing. (AP Photo/Jon Chol Jin)