The Russian Space Chimpanzees are former members of the Russian space program. Other than Stanislav and their leader Caesar, none of the chimps can speak English, and only speak Russian. Stanislav was first seen in Monkey Planet, where he was stranded on the Island of Madagascar as King Julien helped him get back home. The rest of them made their debut in Bad-Year Blimp, as the story unfolds, revealing that after the Russians were no longer in need of them for their space programs, they decommissioned them by abandoning the former cosmonauts on what is now known as the Monkey Island.
After the war was over, they headed back to Russia for revenge against humanity, as they were the ones to leave them on Monkey Island.