Please identify any contemporaneous communication from Putin that he intends to carve a portion of Eastern Ukraine for himself. You won't find one. In any event, you're being pedantic -- obviously there are differences between the Bay of Pigs and the current situation. My point is that the methods of the Russian government in supporting the Ukrainian rebels are substantially similar to the methods of the US government in backing the Bay of Pigs forces, and have similar rationales.
Uh, he already has carved-out a portion of Ukraine for himself. There's "pedantic" for you.