Was that also from the Gates book?
"An outcome of this crisis in which Ukraine embraces neutrality is a key element to achieving NATO’s common interest in de-escalation while also punishing Russia economically and politically for its illegal actions in Crimea. However, that outcome means that advocates of NATO enlargement should concede that their worldview did eventually run into the hard rocks of realism. So far as the impact of the 2008 Ukraine and Georgia declaration combines with questions and risks related to collective defense commitments for new NATO members—enlargement critics had it right. It would be tragic for NATO, and especially for the people of Ukraine, if enlargement advocates hold on to a failed idealism at the risk of diplomatic options that can build long-term stability for the Ukrainian people and help to de-escalate a dangerous situation"
http://nationalinterest.org/feature/understanding%E2%80%94-