Since protests in Kyiv led to the ousting of Yanukovych in February, events have escalated in Ukraine. The country is split between pro-Russian sentiment in the east and those favoring closer ties to the EU in the west.
Massive protests against the pro-Russian course of Viktor Yanukovych throughout the winter of 2013-2014 culminated in a spiral of violence at the end of February. Ukraine's political opposition took over the government after Yanukovych fled the country. Russia then mobilized its military to protect its interests in Crimea and supported a May 16 referendum which led to Crimea's annexation to Russia. In early April, pro-separatist activists in eastern Ukraine took control of key government buildings and established barricades and checkpoints. On 3 May, Ukraine's armed forces began an offensive aimed at re-establishing control in eastern Ukraine. On 12 May, Russia said it "recognized" the results of contested separatist referenda held one day earlier in the provinces of Donetsk and Luhansk. The European Union and the United States now see themselves in one of the potentially most dangerous conflicts since the end of the Cold War.
The situation in Ukraine remains unstable. The Minsk Protocol, an agreement to halt the war in the Donbas region signed in September, has failed to stop fighting between the Ukrainian army and separatists. Russian volunteers are flocking to the front.