Ukraine and Russia-lead rebels have [ agreed to a cease-fire ]( http://www.theguardian.com/world/2014/sep/04/ukraine-nato-ceasefire-leaders-welcome-putin-poroshenko ) . The defeats suffered by Ukraine's forces, after weeks of slowly gaining, seem to prove by themselves that Russia gave the rebels armor, if not troops as well. Therefore, I don't think Putin is willing to let the matter end here.
Ссылка: https://stallman.org/archives/2014-jul-oct.html#05_September_2014_%28Ukaine_and_Russia-lead_rebels_agreed_to_cease-fire%29