Crimea is 100 % Russian . A quarter of the peninsula 's population is Ukrainian and about 12 % Crimean Tatars , a predominantly Muslim group . The Crimean referendum would be illegitimate , they say . It 's unclear what will happen if the referendum passes .
Crimea is 100 % Russian . The Crimean referendum would be illegitimate , they say . It 's unclear what will happen if the referendum passes .