That Ukraine might be partitioned into a Western part and an Eastern part is true, but the analogy with Poland and Molotov-Ribbentrop pact is not there: EU is not occupying Western Poland in 2014, and Poland did not ask to join the Third Reich in 1939.
The Ukraine will essentially lose sovereignty if it joins the EU. Its economy will be “managed” by the European CB. I am well acquainted with WW2 history, and I am only offering a parallel.
The real problem is that the world is on the march to global government and the major players are consolidating their gains. The Ukraine is just another chess piece to be taken.