Armed conflict in eastern Ukraine erupted in early 2014 following Russia’s annexation of Crimea. The previous year, protests in Ukraine’s capital, Kyiv, against Ukrainian President Viktor Yanukovych’s decision to reject a deal for greater economic integration with the European Union (EU) were met with a violent crackdown by state security forces. The protests widened, escalating the conflict, and President Yanukovych fled the country in February 2014.
One month later, in March 2014, Russian troops took control of the Ukrainian region of Crimea. Russian President Vladimir Putin cited the need to protect the rights of Russian citizens and Russian speakers in Crimea and southeast Ukraine. Russia then formally annexed the peninsula after Crimeans voted to join the Russian Federation in a disputed local referendum. The crisis heightened ethnic divisions, and two months later, pro-Russian separatists in the eastern Ukrainian regions of Donetsk and Luhansk held their own independence referendums.
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Armed conflict in the regions quickly broke out between Russian-backed forces and the Ukrainian military. Russia denied military involvement, but both Ukraine and the North Atlantic Treaty Organization (NATO) reported the buildup of Russian troops and military equipment near Donetsk and Russian cross-border shelling immediately following Crimea’s annexation. The conflict transitioned to an active stalemate, with regular shelling and skirmishes occurring along frontlines separating Russian- and Ukrainian-controlled eastern border regions.