http://cepa.org/content/answering-critics-tough-russia-policy
....it is worth stressing that it is not NATO and EU expansion that have undermined the existing European security order. All the international agreements mentioned explicitly (and rightly) underline the right of individual countries to make choices about their future. If Belarus wants to join the Eurasian Economic Union, it can. The West is not going to invade that country’s western districts, or support insurrections there, on the grounds that the ancient Polish lands around Brest and Grodno have a different historical destiny and became part of Belarus only because of an accident of history. So why cannot Ukraine, for its part, make a decision to look to Europe?