The document discusses the Ukraine crisis between Russia and Western countries in 2014. It summarizes that former Ukrainian president Yanukovych abandoned a trade deal with the EU in favor of an investment agreement with Russia, sparking mass protests. Russia then annexed Crimea after a referendum, threatening Ukraine's territorial integrity. The crisis highlighted a power struggle between Russia seeking to maintain influence and the West supporting Ukrainian sovereignty. International relations theories of realism and defensive/offensive approaches help explain Russia's aggressive actions under Putin to regain regional power lost after the Soviet Union's collapse.