Planetary War I (Imperial Re-Uprising)

The First Planetary War, occurred between 2460-2510, between the superpowers of the world, namely that of Russia, Germany, the Dixie Republic, Serbia, the Pax Islamica, Japan and Indonesia, the Free Planetary Coalition, against the forces of the United Planetary Communists, known as the Galactic Reds.
After the fall of the Communist Party of China, and surrender of Beijing in 2320, the People's Republic of China was reduced to just Manchuria, with a puppet state in California. Prior, the PRC was a space superpower that operated the world's 3rd-largest space military.
After losing most of Mainland China, the CPC's leadership ordered whatever remained of the aerospace forces, and set up its new abode on the unexplored regions of Mars and Venus. The citizens of both PRCs, China and California, were not aware that the Communist Party was setting up empires in Mars and Venus. This planetary communist bloc, had herself, become a superpower, with enough to combat the reigning ones.
They dug underground, made treaties with E.T., who promised them that they would help re-conquer Earth. 
In 2430 however, Russian, German and Japanese space scouts discovered thousands upon thousands of Chinese space warships parked in the southern regions of Mars and Venus. They also discovered massive cities under construction, and alongside ancient sites, to which they had assumed were undiscovered alien cities. They bore the flag of the People's Republic of China, the old Soviet Union, as well as that of the People's Republic of California.
In 2431, both Red China and California's government were questioned, however they denied the existance of a secret military empire. However, Russian Supreme Leader Miriam Petrova was not stupid, and the major powers of the world, even that of Cydonia, met in Moscow, known as the 2431 Moscow Convention.
Lee Huang-Yang, the main Commander of this secret military empire, knew that at this point, he had been discovered, and ordered the forces in Mars and Venus to being mobilizing for war. The Red attack on Cydonia led the major powers of the world to declare war against both PRCs, or whatever secret military was funding them.