Love, love, love having a leader who is intelligent. I think signing the economic agreement with the EU during the ceasefire re-frames any future Russian aggression, should it come.
It will be hard to see it as anything other than anti-EU aggression.
President Poroshenko decided to extend the ceasefire plan for 72 hours. He has made this decision after consulting with the western diplomats. Prior to that Poroshenko had a discussion with the government security services.