Explain simply why the CCP is the correct answer to: Passage: In 1921 the Soviet Union began supporting the Kuomintang (KMT), and in 1923 the Comintern instructed the Chinese Communist Party (commonly abbreviated as CCP) to sign a military treaty with the KMT. On May 31, 1924, the two governments signed an agreement to establish diplomatic relations, while the Soviet government renounced in that agreement all privileges granted to the Tsarist government in China. But in 1926 KMT leader Chiang Kai-shek abruptly dismissed his Soviet advisers and imposed restrictions on CCP participation in the government. By 1927, after the conclusion of the Northern Expedition, Chiang purged the CCP from the KMT-CCP alliance, resulting in the Chinese Civil War which would last until 1949, a few months after the proclamation of the People's Republic of China, led by Mao Zedong. During the war the Soviets gave some support to the CCP, which in 1934 suffered a crushing blow when the KMT brought an end to the Chinese Soviet Republic, thus causing the CCP's Long March from Shaanxi. The Soviet Union tried and failed in an attempt to make the Hui hostile to China.

Question: Based on this passage, who did the soviet union support in china civil war?. Explanation:
The relevant information is: During the war the Soviets gave some support to the CCP, which in 1934 suffered a crushing blow when the KMT brought an end to the Chinese Soviet Republic, thus causing the CCP's Long March from Shaanxi.