While only about 38+% of Ukraine is ethnic Russian, outside of the far Western provinces most are either pro-Russian or ambivalent.
There will not be an insurgency against Russia except if they take the historically Polish/Western provinces.
And they've essentially offered those to Poland.
Ribbentrop II.
Still, if Ukraine is so comfortable with Putin, what was the point of breaking away from Yeltsin and the Russian Federation?
The Referendum for Ukraine's independence received more than 90% of the vote in 1991.