The events in Kyiv that ousted Ukrainian president Viktor Yanukovych on 22 February 2014 sparked pro-Russian and anti-separatism[35]demonstrations in Crimea. At the same time, Russian president Vladimir Putin discussed Ukrainian events with security chiefs, remarking that "we must start working on returning Crimea to Russia". On 27 February, Russian special forces without insignia[36] seized strategic sites across Crimea.[37][38] Although Russia at first denied its military involvement,[39] Putin later admitted that troops were deployed to "stand behind Crimea's self-defence forces".[40] As Russian troops occupied Crimea's parliament, it dismissed the Crimean government, installed the pro-Russian Aksyonov government, and announced a referendum on Crimea's status. The referendum was held under Russian occupation and, according to the Russian-installed authorities, the result was overwhelmingly in favor of joining Russia. The next day, 17 March 2014, Crimea's authorities declared independence and requested to join Russia.[41][42] Russia formally incorporated Crimea on 18 March 2014 as the Republic of Crimea and federal city of Sevastopol.[43][40] Following the annexation,[44] Russia built up its military presence on the peninsula and warned against any outside intervention.[45]
Ukraine and many other countries condemned the annexation and consider it to be a violation of international law and Russian agreements safeguarding the territorial integrity of Ukraine. The annexation led to the other members of the G8 suspending Russia from the group[46] and introducing sanctions. The United Nations General Assembly also rejected the referendum and annexation, adopting a resolution affirming the "territorial integrity of Ukraine within its internationally recognised borders",[47][48] and referring to the Russian action as a "temporary occupation".[49]
The Russian government opposes the "annexation" label, with Putin defending the referendum as complying with the principle of the self-determination of peoples.[50][51]
^"Ukraine v. Russia (re Crimea) (decision)". European Court of Human Rights. January 2021. The Ukrainian Government maintains that the Russian Federation has from 27 February 2014 exercised effective control over the Autonomous Republic of Crimea and the city of Sevastopol ... There was sufficient evidence that during the relevant period the respondent State [Russia] had exercised effective control over Crimea.
^Sasse, Gwendolyn (2023). Russia's War Against Ukraine. Wiley & Sons. p. 2004. Russia's war against Ukraine began with the annexation of Crimea on 27 February 2014. On that day, Russian special forces without any uniform insignia appeared in Crimea, quickly taking control of strategic, military and political institutions.
^DeBenedictis, Kent (2022). Russian 'Hybrid Warfare' and the Annexation of Crimea. Bloomsbury Publishing. p. 140. During the night of 26–27 February, Russian special forces without insignia departed Sevastopol ... They arrived at the Crimean Rada and Council of Ministers buildings in Simferopol, disarmed the security and took control of the buildings ... Putin later signed a decree designating 27 February as Special Operations Forces Day in Russia.
^"7683rd meeting of the United Nations Security Council. Thursday, 28 April 2016, 3 p.m. New York". Mr. Prystaiko (Ukraine): I have to remind the Council that the official medal that was produced by the Russian Federation for the so-called return of Crimea has the dates on it, starting with 20 February, which is the day before that agreement was brought to the attention of the Security Council by the representative of the Russian Federation. Therefore, the Russian Federation started – not just planned, but started – the annexation of Crimea the day before we reached the first agreement and while President Yanukovych was still in power.
^Lessons from Russia's Operations in Crimea and Eastern Ukraine, page 19, published by RAND Corporation in 2017. "Ukraine's government was in transition following the ouster of Yanukovych. As a result, it did not react to the Russian operation when launched. Russia's task was made relatively easy by the confusion and chaos that generally follows an uprising, such as what happened in Kyiv. Moscow capitalized on the tensions and uncertainty in Crimea, as well as on the inexperience of Ukraine's provisional government. Meeting notes of the discussion among Ukrainian leadership reveal a great deal of anxiety, uncertainty, and unwillingness to take action for fear of escalation."
^Simon Shuster (10 March 2014). "Putin's Man in Crimea Is Ukraine's Worst Nightmare". Time. Retrieved 8 March 2015. Before dawn on Feb.27, at least two dozen heavily armed men stormed the Crimean parliament building and the nearby headquarters of the regional government, bringing with them a cache of assault rifles and rocket propelled grenades. A few hours later, Aksyonov walked into the parliament and, after a brief round of talks with the gunmen, began to gather a quorum of the chamber's lawmakers.
^De Carbonnel, Alissa (13 March 2014). "RPT-INSIGHT-How the separatists delivered Crimea to Moscow". Reuters. Retrieved 8 March 2015. Only a week after gunmen planted the Russian flag on the local parliament, Aksyonov and his allies held another vote and declared parliament was appealing to Putin to annex Crimea
^Boris N. Mamlyuk (6 July 2015). "The Ukraine Crisis, Cold War II, and International Law". The German Law Journal. SSRN2627417.
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