No. The Russian military base https://en.wikipedia.org/wiki/Sevastopol_Naval_Base was always there, and especially it was there as a Russian base since the breakup of Ukraine from USSR, so already for a decade and a half before 2014. Moreover, even before 2014 Crimea was an Autonomous Republic in Ukraine, since 1991.
Compared to that, Kosovo was not even a republic, but an "autonomous area" in the Republic of Serbia before the U.S. war, and there was surely zero U.S. military bases there before. Which says something, seeing:
