Vladimir Putin-Kim Jong-un summit: what do both sides aim to gain?

North Korean leader Kim Jong-un’s meeting with Russian President Vladimir Putin in Vladivostok provides an intriguing twist to the global diplomatic push to resolve the nuclear stand-off with Pyongyang, which appeared to hit a wall after a summit between Kim and US President Donald Trump collapsed in February.It also adds a chapter to the storied but often strained friendship between Pyongyang and Moscow, which was forged in the blood of war and weathered by the Soviet collapse and tensions…