Russia's Black Sea Fleet base in Sevastopol has long been Moscow's top strategic priority in Crimea. So did the base play a role in Russia's decision to intervene in Crimea?
In 2010, just a couple of months after taking office, then-President of Ukraine Viktor Yanukovych extended Russia's lease of the Sevastopol base until 2042. And in December 2013, when Russia agreed to a big economic aid package for Ukraine following Yanukovych's decision to drop negotiations with the European Union, Yanukovych appeared poised to accept a long-time Russian demand, that Ukraine drop restrictions on Russia expanding the size and power of the fleet. Russian military expert Dmitry Gorenburg told The Bug Pit at the time that the move was "potentially very significant" and that an agreement "would probably create an environment where subsequent presidents wouldn't be able to prevent replacement."
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