The People Have Stood Up!
Conquered all of Nationalist China's starting territory
Go straight to Exploit the Weak Neighbours focus in order to annex Shanxi and Xibei San Ma. Once the focus is complete, Declare on Shanxi. As soon as you do, justify on Sinkiang. Justify on Tibet if desired. Once Shanxi capitulates, declare on Xibei San Ma. They will not have any men on the northern border so encircle them there. Improve relations with the Soviet Union and build 2+ Land forts on the border of Mengkukuo. Once Xibei San Ma capitulates, join the Comintern. This is so that Sinkiang does not have a chance to join the Comintern when at war with them. Declare war on Sinkiang when ready. Do Tibet if possible. Do not call your allies.
Once Sinkiang capitulates, leave the Comintern. If done fast enough, this will all be before Japan declares war. Place as much troops as possible on the Mengkukuo border. Once Japan declares war on China, Join their faction and the war. Mengkukuo may not be well defended. Push there quickly as far as possible before the Japanese place their troops. The rest will rely on China's strength and competency. It is unnecessary to place men on the Chinese-Japanese border right now. Build a lot of divisions. the 6 infantry division template is fine, but it is a good idea to have a separate one with 2 Artillery 7 Infantry. Push to Manchukuo from your border in order to take the land instead of China. Add land forts on your border with China just in case. During this time, the Chinese may be losing a lot of land. Help them where necessary. If any Japanese are in your territory or bordering it, push them out there. China may not capitulate even if Chongqing falls. If they capitulate, you lose the war because you are not a major power. The main focus however, is to push the Japanese out of Manchuria. Take the 100 Regiments Campaign in order to get better attack against the Japanese. Remember to take Agrarian Socialism so that Mao would stay your leader. Attack weak points and encircle the Japanese. Once at Manchuria, the Chinese would be pushing the Japanese back in the south. Leave them alone for now so that the Chinese gets a bit more weaker for the next war. Instead push the Japanese out of Korea and the north. Once Japan is out of the north, Help the Chinese and push the Japanese out of China in the south.
Now is a good time to take the focus infiltration. Once you think the war is nearly won, with a few medium sized Japanese patches, pause, delete a unit and take an infiltration decision. This will take 60 days. Remove the Japanese patches during that time. As you do that, get divisions ready for the war with China. When China white peaces the Japanese, if done correctly, You will take Manchuria and Mengkukuo. Place divisions there. After the 60 days take the infiltration decision that gets you to war with China. It will take another 60 days. When you are at war with China, push quickly until their divisions are met then stall a bit while pushing not as quickly. This is also a good time to take Tibet, Nepal, and Bhutan as they will join the Chinese United Front because they are non-aligned. Afghanistan, Iran and the rest of the middle east is good too if desired. However, Afghanistan may be difficult because of the thin mountain border. Justify on 2 of them at a time. Be aware that they might join the Allies instead. When desired, capitulate and annex all of China.