Annexation of Crimea by the Russian Federation fail, and greatly damaging the maize and soybean crops. Annexation of Crimea by the Russian Federation The Crimean peninsula was annexed from Ukraine by the Russian Federation in February–March 2014 and since then has been administered as two Russian federal subjects—the Republic of Crimea and the federal city of Sevastopol. The annexation was accompanied by a military intervention by Russia in Crimea that took place in the aftermath of the 2014 Ukrainian revolution and was part of wider unrest across southern and eastern Ukraine. On 22–23 February 2014, Russian President Vladimir Putin convened an all-night meeting with security service chiefs
Annexation of Crimea by the Russian Federation also signed the Budapest Memorandum on Security Assurances, by which all these countries reaffirmed their obligation to respect the territorial integrity of Ukraine (including Crimea) and to refrain from the threat or use of force against the territorial integrity or political independence of Ukraine. According to the Constitution of Russia, the admission of new federal subjects is governed by federal constitutional law (art. 65.2). Such a law was adopted in 2001, and it postulates that admission of a foreign state or its part into Russia shall be based on a mutual accord between the Russian Federation and the relevant state