Original sentence: China participated in the Korean War when it sent the People's Volunteer Army to battle United Nations troops in October 1950.China, under the Kuomintang government, allowed the Provisional Government of the Republic of Korea to establish a government in exile in Shanghai in 1919, which was later moved to Chongqing following the outbreak of the Second Sino-Japanese War.Confucianism became influential and remain a fundamental part of Korean society.For a long period of time, Korea served as tributary state to China, while maintaining their independence.In 1593, Ming forces aided the Koreans during the Imjin War, ending with Japanese defeat in 1598.It successfully drove the UN forces out of North Korea, but its own offensive into South Korea was repelled.Korea was under Japanese occupation from 1910 to 1945.Ming China and Joseon Korea maintained a close diplomatic and trade relation.The Korean Liberation Army was formed in 1941, and coordinated Korean resistance against Japanese occupation, until the end of World War II.The Korean War ended by July 1953, resulting in the establishment of the Korean Demilitarized Zone, and the eventual withdraw of Chinese forces.The PRC government has recently begun the Northeast Project, a controversial Chinese government research project claiming Goguryeo and other various kingdoms, including Gojoseon, Buyeo and Balhae, to be Chinese states and thus part of historical Chinese territory.Throughout history, the governments in China and Korea had maintained diplomatic contact
Edited sentence: The PRC government has recently begun the Northeast Project, a controversial Chinese government research project claiming Goguryeo and other various Korean kingdoms, including Gojoseon, Buyeo and Balhae, to be Chinese states and thus part of historical Chinese territory