Siberia refers to the northeast area of Asia that is part of Russia.
Siberia remained part of GDI-controlled Russia, although Nod activity was a constant threat. Given the empty, isolated and inhospitable nature of large parts of Siberia, it is no surprise that Nod would base some of its more notorious secret projects here, where Kane's plan can be carried out far from prying eyes. The most notable of these is undoubtedly the Marked of Kane project. One day, GDI decided to do something about this and built a large base in the heart of Siberia to monitor things. Unfortunately, it was built right on top of where the Marked of Kane cyborgs were lying dormant underground. When they were activated in 2052, the base was promptly overran and razed.
Siberia has been largely spared from the ravages of Tiberium, with some areas in the Far East still classified as pristine Blue Zones.
Red Alert universe
During the Second World War, Siberia became the staging ground for the Soviet invasion of East Asia. Several Allied operations took place in the region as well.