North Korean leader Kim Jong Un arrived Sunday in Singapore ahead of one of the most unusual and highly anticipated summits in recent world history, a sit-down with President Donald Trump meant to settle a standoff over Pyongyang’s nuclear bomb arsenal.

Kim Yong Chol is due to meet with U.S. Secretary of State Mike Pompeo on Wednesday and Thursday to discuss whether to go ahead with an unprecedented meeting between U.S. President Donald Trump and North Korean leader Kim.

While peace between the warring North and South Koreas seemed feasible just weeks ago, North Korea has expressed hesitation at dismantling its nuclear weapons arsenal, calling the demands unilateral.