The conflict began in 2014 following Ukraine's revolution and initially focused on Crimea and parts of Donbas. Russia annexed Crimea and a war broke out between Ukraine and Russian-backed separatists in Donbas. From 2021, tensions escalated as Russia built up forces near Ukraine and demanded it be barred from NATO. In February 2022, Russia recognized separatist states in Donbas and invaded Ukraine, launching a full-scale war that has been condemned by most of the international community.