They voted only -after- Russia took military control over Crimea. All the while Russia was claiming that the soldiers were not Russian, and they had removed flags and ensignas from uniforms and vehicles - a ridiculous move, as everyone in the world knew they were Russian soldiers.
You know someone is doing something wrong when they are
trying to hide it.
Later, when everything was under control, Putin admitted yes, they were Russian soldiers. As if this was clear from the beginning and the Kremling had never claimed anything different. Reminded me of 1984... warp the past to suite your present.
So this is your Democracy... Russian style.
Same thing happening now in eastern Ukraine, with "maybe" there being "inofficially" Russian solders there. "On vacation".