What is the Ukrainian crisis? Can you summarize it? This book is too troublesome to understand.

The Ukrainian crisis was caused by Ukrainian pro-Russian President Yanukovych suspending the signing of political and free trade agreements with the EU at the end of 20 13, trying to strengthen relations with Russia. 2013165438+122 October, pro-European Ukraine held an anti-government demonstration in Kiev, protesting against the masses' demands for the government to sign an association country agreement with the EU, Yanukovych's stepping down and early elections. 2065438+On February 22, 2004, Yanukovych was dismissed from the presidency by the parliament and announced that the presidential election would be held on May 25 of the same year. On March 1 1, the Parliament of Crimea adopted the Declaration of Independence of Crimea. On April 7, pro-Russian people in Donetsk, Ukraine announced "independent public investment in Russia". On April 30th, Turchinov announced that the Ukrainian armed forces had entered a state of comprehensive combat readiness and decided to recruit soldiers. In June, 5438+02, Donetsk and Luhansk States in eastern Ukraine declared the establishment of independent "sovereign states". On the 25th, Ukraine held a presidential election.