Eastern Europe
The Crimean War was once described by the Thirteenth Doctor as a "terrible conflict on the border of Eastern Europe". (GAME: Flux Fixers [+]Loading...["Flux Fixers (game)"]) In an altered timeline's version of this war, the British were pitted against the Sontarans, who had changed history by replacing Russia and China with their own nation, Sontar. (TV: War of the Sontarans [+]Loading...["War of the Sontarans (TV story)"])
Bosnia was located in Eastern Europe. (PROSE: Torchwood: The Encyclopedia [+]Loading...["Torchwood: The Encyclopedia (reference book)"])
In the history in which the Ironsides were never discovered by the Eleventh Doctor, the Germans turned their forces against the Soviet Union after being defeated in the Battle of Britain by the Ironsides. However, they were forced to retreat to Germany after the Ironsides paved the way for Allied forces to liberate France, allowing the Russians to spread across Eastern Europe at the other end of the Allied pincer movement. (PROSE: The Ironside Advance [+]Loading...["The Ironside Advance (short story)"])