Crimea which juts out into the Black Sea off southern Ukraine was absorbed into the Russian Empire along with most ethnic Ukrainian territory by Catherine the Great in the 18th century.
Crimea autonomous republic southern Ukraine. The republic is coterminous with the Crimean Peninsula lying between the Black Sea and the Sea of Azov. In 2014 Russia covertly invaded and illegally annexed Crimea a move that was denounced by the international community.
After Ukrainian independence in 1991 most of the peninsula was reorganised as the Autonomous Republic of Crimea. The Soviet fleet in Crimea was in contention but a 1997 treaty allowed Russia to continue basing its fleet in Sevastopol.
https://en.wikipedia.org/wiki/Crimea
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