The Russo-Ukrainian War is an ongoing war primarily involving Russia and pro-Russian separatist forces on one side, and Ukraine and its international supporters on the other. It began in February 2014 following the Ukrainian Revolution of Dignity, and initially focused on the status of Crimea and parts of the Donbas, internationally recognised as part of Ukraine. The first eight years of the conflict included the Russian annexation of Crimea (2014) and the war in Donbas (2014–present) between Ukraine and Russian-backed separatists, as well as naval incidents, cyberwarfare, and political tensions. Following a Russian military build-up on the Russia–Ukraine border from late 2021, the war expanded significantly when Russia launched a full-scale invasion of Ukraine on 24 February 2022.