This is the best tl;dr I could make, original reduced by 91%. (I’m a bot)
China and North Korea’s close ties date back to the founding of the People’s Republic in 1949, and the outbreak of the Korean War in the latter a year later, a conflict in which Chinese troops supported North Korean forces, with the backing of the Soviet Union, against South Korea and a U.S.-led United Nations coalition.
The Biden administration has said it was reviewing the U.S. approach to North Korea after former President Donald Trump unsuccessfully sought to forge a denuclearization-for-peace and sanctions relief agreement with Kim Jong Un, and became the first sitting U.S. president to meet a North Korean supreme leader.
Biden had sent Blinken and Defense Secretary Lloyd Austin to South Korea and Japan just ahead of the U.S.-China talks in Alaska, and discussed a strategy for “The denuclearization of North Korea” on both stops.