That is sheer and utter BS. You are making some post facto big deal about being with the Russians.
In 1933 the US recognized the USSR...of course they were asked not to spread communist propaganda in the USA. 1933 was 7 years after Sun's death. Communism was still in its infancy back in the 1920s. Mussolini founded his party in 1919. The CCP in China was not even (fully) organized until 1922.
Sun joined with the Soviets because of AMERICA. America would not help anyone, so the choice was either the Soviets, or no more revolution. America's foreign policy at those times, was f-you. Its not our problem...They had the same stance in Europe and Asia both.
Read Sun's books. He was worried about gaining control of China first, then implementing his plan, over time, second. He wrote specifically about not going radically from one system to another...
The US and Britain supported Sun Chuanfang, a warlord who controlled the eastern part of China, including Shanghai. After Chiang Kai-Shek's troops entered Shanghai and promised to protect American and British interets in China, America started suppoting Chiang. The US was not neutral in the Chinese civil wars.
>>He wrote specifically about not going radically from one system to another...
Sun tried more than seven times to use force to overthrow the existing governments, the central govt. in Beijing and the local governments in Guangdong, after ROC was established. Sun wanted power. Sun was not G. Washington.