Hmm. I did a little reading. Interesting. Here's something I found.

en.wikipedia.org/wiki/Transfer…

Nina Khrushcheva, a political scientist and the great-granddaughter of Nikita Khrushchev, said of his motivation, "it was somewhat symbolic, somewhat trying to reshuffle the centralized system and also, full disclosure, Nikita Khrushchev was very fond of Ukraine, so I think to some degree it was also a personal gesture toward his favorite republic. He was ethnically Russian, but he really felt great affinity with Ukraine." Sergei Khrushchev, Khrushchev's son, claimed that the decision was due to the building of a hydro-electric dam on the Dnieper River and the consequent desire for all the administration to be under one body. Since Sevastopol in Crimea was the site of the Black Sea Fleet, a quintessential element of Soviet and then of Russian foreign policy, the transfer had the intended effect of binding Ukraine inexorably to Russia, "Eternally Together", as a poster commemorating the event proclaimed. Other reasons given were the integration of the economies of Ukraine and Crimea and the idea that Crimea was a natural extension of the Ukrainian steppes. There was also a desire to repopulate parts of Crimea with Slavic peoples, mainly Russians and Ukrainians, after the peninsula was subject to large-scale deportations of Crimean Tatars to Central Asia by the Soviet regime in 1944.