Anti-Government (Ukraine) vs. Pro-Russian Rebels conflict: 6100+ killed February 2014- current

Ukraine became gripped by unrest when President Viktor Yanukovych refused to sign an association agreement with the European Union on 21 November 2013. An organized political movement known as 'Euromaidan' demanded closer ties with the European Union, and the ousting of Yanukovych. This movement was ultimately successful, culminating in the February 2014 revolution, which removed Yanukovych and his government.[56] However, some people in largely Russophone eastern and southern Ukraine, the traditional bases of support for Yanukovych and his Party of the Regions, did not approve of the revolution, and began to protest in favour of closer ties with Russia. Various demonstrations were held in Crimea in favour of leaving Ukraine and accession to the Russian Federation, leading to the 2014 Crimean crisis.
http://en.wikipedia.org/wiki/2014_pro-Russian_unrest_in_Ukraine