From Leon Aron, Director of Russian studies at the American Enterprise Institute:
…By withholding military assistance to Ukraine — the only thing that could have changed Putin’s mind by giving Kiev a chance to turn the tide on the battlefield — the West has greatly contributed to [Ukrainian President] Poroshenko’s decision to accept a very bad deal. No amount of ovation, not even a standing one, during Poroshenko’s address to the joint session of Congress today can obscure this grim reality.
Read more at A Premature Party for Poroshenko.