The Great Russian-Ukrainian War

Was the war in which Ukraine declared war on Russia and tried to conquer its lands and remove all historical influence that it had on it for once.

It almost won during one part but later failed and Russia destroyed the Ukrainian Empire and replaced them with the Soviet puppet of Byelorussian-Ukrainian SRball.

Russia couldn't really just annexx all those lands due to international criticism, sanctions and maybe one great military represalia by the West's part as they wanted to pose as the wronged side of the story, plus the region still had many anti Russian insurgents. So creating Byelorussian-Ukrainian SR to the full russification of the region was the best option.