"Let's not have very high expectations on this meeting," Poroshenko told a press conference alongside Solberg. "Am I optimistic enough? Yes I'm very optimistic about the future of Ukraine but unfortunately not so optimistic about tomorrow's meeting."
Poroshenko and the Russian, French and German leaders will meet in Berlin on Wednesday to "assess the implementation" of the Minsk agreement aiming to solve the Ukrainian conflict, which has now entered its third year.
Accusing Moscow of violating its commitment to the Minsk agreement, Poroshenko said: "peace in Europe depends solely on Putin."