If I were you, I would flee to the Pyreenes. If that fails, then GTFO of Europe and go make Beria pay for that attack! How did he DARE to attack you during a war against Germany?! The NERVE of some people!
Also, having Nat China help you in this war will be of great help. Turning the tables in Asia is a good idea, methinks. All that Chinese infantry, just waiting to be built and sent to die on European battlefields...