Answer:
Nikita Khrushchev gave Crimea to Ukraine
Yuriy Meshkov took Crimea back from Ukraine
Step-by-step explanation:
Nikita Khrushchev was the Russian leader that sanctioned the transfer of the Crimean Oblast on April 26th, 1954 from the Soviet Union to Ukraine.
This transfer was as a measure of goodwill because it was used as a symbolism to mark the 300th anniversary of Ukraine being part of Russia.
Although Nikita Khrushchev sanctioned the transfer, the document was signed by Kliment Voroshilov.
However, in 1994, a Russian leader Yuriy Meshkov took over Crimea and on March 18, 2014, Russia officially annexed Crimea and incorporated it as the Republic of Crimea.