1899-1900 Russian and Japanese encroachment
1911 Under the Republic of China
1931 Japanese invasion and Manchukuo
After World War II Manchuria is a region in East Asia, belonged to PRC
Korean War Period
Chinese forces used Manchuria as a base to assist North Korea against the UN forces.
Cold War Era
Manchuria became a matter of contention, escalating to the Sino–Soviet border conflict in 1969. The Sino-Russian border dispute was resolved diplomatically only in 2004.