The People's Republic of China has, since its founding, had strong ties with the US and Soviet rump state. When the Nazis started to head far east, China decided to fight back. The Army and Navy are ready. However, China now just must choose where to strike first. The Army can cut the German advance off from supplies through Irkutsk, the Navy is in the Atlantic waiting for a target and some are calling not to use one or the other but both. Of course, some say China should gain help from neighboring states.
In the end, the Chinese leadership chooses to: