Final answer:
In 1954, Crimea was transferred to the Ukrainian SSR; in 2014, it was annexed by Russia.
Step-by-step explanation:
In 1954, Crimea was transferred to the Ukrainian SSR (Ukrainian Soviet Socialist Republic). This occurred during the Soviet era, where the Soviet Union established republics corresponding to major ethnic groups within its vast territory.
However, in 2014, Crimea was annexed by Russia, which marked a significant geopolitical event in the region, harkening back to actions reminiscent of the Soviet times.