The CER was a joint project of China and Russia, and after the Russo-Japanese War, the Japanese took over the southern portion of the CER, forming the South Manchuria Railway, with the northern portions remaining under Sino-Russian control. Following the October Revolution, the railway was controlled by White Russians for a time during the Russian Civil War, but from 1917 the government of the Republic of China began taking more control of the railway to itself, until in 1922 the CER was made officially a Sino-Soviet joint enterprise. However, in 1929 the Chinese seized complete control of the CER, storming the Soviet consulate in Harbin and arresting the officials of the CER. This led to the Sino-Soviet conflict of 1929, in which the Soviets quickly defeated the Chinese army and forced the Chinese to once again accept joint control of the railway. After the Mukden Incident, the Soviets retained control over the railway despite the Japanese occupation of northeastern China; after the establishment of Manchukuo in 1932, the CER became a joint Soviet-Manchukuo enterprise called the "North Manchuria Railway". In March 1935, the government of Manchukuo bought the Soviet share of the NMR for 140 million yen, and the entire network was taken over by the Manchukuo National Railway.