Annexation of Crimea

The Annexation of Crimea refers to Russia's seizure and incorporation of the Crimean Peninsula from Ukraine in early 2014, following the ouster of Ukrainian President Viktor Yanukovych during the Euromaidan protests.

In late February 2014, unmarked armed personnel—widely identified as Russian soldiers and later acknowledged by President Vladimir Putin—took control of key sites in Crimea, including the Supreme Council building in Simferopol and Sevastopol port facilities. A new regional leadership under Sergey Aksyonov announced a referendum on Crimea's status, held on 16 March 2014, which Russian authorities reported passed with roughly 96% support for joining Russia. On 18 March 2014, Putin signed a treaty incorporating the Republic of Crimea and the federal city of Sevastopol into the Russian Federation.

The action was widely condemned as a violation of:

• The UN Charter (Article 2(4) on territorial integrity)
• The 1994 Budapest Memorandum, in which Russia, the US, and UK gave security assurances to Ukraine in exchange for Ukrainian denuclearization
• The 1997 Russia–Ukraine Friendship Treaty
• The 1975 Helsinki Final Act

On 27 March 2014, the UN General Assembly adopted Resolution 68/262 affirming Ukraine's territorial integrity and declaring the referendum invalid; 100 states voted in favor, 11 against, and 58 abstained. The G8 suspended Russia's membership, reverting to the G7. The EU, US, Canada, Australia, and others imposed targeted sanctions on Russian officials and entities, expanded after the parallel conflict in Donbas.

Ukraine, most UN member states, and international bodies including the Council of Europe Parliamentary Assembly and the OSCE continue to treat Crimea as Ukrainian territory under Russian occupation. The annexation set a precedent invoked again during Russia's claimed annexations of Donetsk, Luhansk, Zaporizhzhia, and Kherson in September 2022, following the full-scale invasion launched in February 2022.