Zab - Russia did not take over parts of Ukraine. In Crimea there was a referendum with international observers present. They voted to secede and join Russia overwhelmingly, 90%+. As for the Russian speaking eastern part of Ukraine, they are still part of Ukraine simply defending themselves.
The new unelected government of Ukraine (Yatsenuke, Timoshenko et al) called for the elimination of the Russian language in Ukraine and the elimination (genocide) of all Russian speakers in Ukraine, in fact Timoshenko, called for nuking eastern Ukraine.
These Russian speakers have lived there for generations and until recently were historically always a part of Russia.