How mean of the Ukrainians to place their territory under the Russian army.
No, you’ve got that wrong. Khrushchev transferred Crimea to Ukraine in 1954 after 300 years of Russian control. Remember, at the time both were part of the Soviet Union. Crimea is Russian.
In 1954, the Presidium of the Supreme Soviet of the Soviet Union transferred the Crimean Oblast from the Russian SFSR to the Ukrainian SSR. The territory had been recognized within the Soviet Union as having “close ties” to the Ukrainian SSR, and the transfer commemorated the Union of Russia and Ukraine Tercentenary.