Following the Ukrainian Revolution of Dignity in 2014, Ukraine's Crimean Peninsula was occupied by unmarked Russian forces, and later annexed by Russia, while pro-Russia separatists simultaneously engaged the Ukrainian military in an armed conflict for control over eastern Ukraine; these events marked the beginning of the Russo-Ukrainian War. In a major escalation of the conflict on 24 February 2022, Russia launched a full-scale invasion of the Ukrainian mainland across a broad front, causing Ukraine to sever all formal diplomatic ties with Russia.