https://historyofyesterday.com/when-russia-gave-crimea-to-ukraine-5547b57170f
https://en.wikipedia.org/wiki/1954_transfer_of_Crimea
https://en.wikipedia.org/wiki/History_of_Crimea#Russian_Empire_(1783%E2%80%931917)
https://en.wikipedia.org/wiki/Russian_Revolution
https://en.wikipedia.org/wiki/Russo-Turkish_War_(1768%E2%80%931774)
https://www.wilsoncenter.org/publication/why-did-russia-give-away-crimea-sixty-years-ago