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.
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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.
http://lb.ua/news/2014/06/27/271316_poroshenko_reshil_prodlit_peremirie.html