little background; crimea was annexd by russia in 1783,and in 1917 the population held a refferendum for vote for independance and it was ;yes, the bolsheviks crushed the independant crimea with force.
in the 1920-1930 the inteligentia was killed by sovjet-russia and after ww2 all crimean tatars were moved away by force from crimea and in that move killed over half of the population and Stalin sent in etnic-russians to colonize the penisula,and the tatars could return to their homeland only after 1980 glaznost.
Russia has done nothing more than forcibly tried to make crimea slavic,by oppressing the original population there,so the latest vote to join russia was far from democratic,
and the crimeans were tatars looooooooooooong before they were russians