Crimean Tartars are a substantial group in Crimea as well, and they (for historical reasons) are very sceptical of the Russians.. http://en.wikipedia.org/wiki/File:Crimean_Tatar_2001-num.svg
Updated figures:
58.32% Russians
24.32% Ukrainians
12.03% Tarters
58.2% Russians 27.5% Ukrainians Rest are mixed.