KYIV, Sept 11 - President Petro Poroshenko will deliver a speech at the opening of the plenary session of the 15th Annual Meeting of Yalta European Strategy (YES), the forum's press service reported.

"The plenary sessions of the 15th Yalta European Strategy (YES) Annual Meeting will start with a speech by Ukrainian President Petro Poroshenko. The discussion between the forum audience and the President will be moderated by Richard Haass, President of the Council on Foreign Relations," reads a report posted on the YES website on Tuesday.