"I have no doubt that the Ukraine-EU Association Agreement, which is a comprehensive roadmap of internal reforms, will take effect shortly and the Deep and Comprehensive Free Trade Area agreement will be enforced starting on January 1, 2016," he said at the 12th Annual Meeting of the Yalta European Strategy (YES) in Kyiv on Friday. "The cunning attempts of Russia to obstruct this historic event are doomed to failure, it is impossible to stop Ukraine's progress [along the path of European integration], there is no way back," Poroshenko said.