Censor.NET reports citing Interfax-Ukraine.
"As the president of the country at war, I must be an optimist, otherwise there is no chance to win," he said answering journalists' questions about the future of the Association Agreement ratification in Maastricht, The Netherlands.
Poroshenko noted the importance of the existing unity and solidarity between the EU and Ukraine.
"I am confident that Europe will be united. I believe that the Association Agreement with the EU will be ratified, implemented and will meet the interests of the EU, interests of The Netherlands, and interests of Ukraine," he said.