China–North Korea relations

The bilateral relations between the People's Republic of China (PRC) and the Democratic People's Republic of Korea (DPRK) have been generally friendly, officially described as a traditional friendly and cooperative relationship, although they have been somewhat strained in the 21st century because of North Korea's nuclear program. China and North Korea established diplomatic relations on 6 October 1949, five days after the declaration of the PRC. In 1950, China intervened in the Korean War through the People's Volunteer Army after the North Korean forces had been shattered by United Nations/United States forces, successfully ensuring North Korea's survival.

Source: Wikipedia — China–North Korea relations (CC BY-SA 4.0)