YEREVAN. - The possible talks of the Armenian and Azerbaijani presidents in June will encounter an obstacle: the sides have way too many controversies, Deputy Director of Caucasus Institute, political analyst Sergey Minasyan said at a press-conference Wednesday.

In his words, the optimism round the agreements in Vienna is exaggerated. ''We have apparently achieved success on the diplomatic platform. There is also slight progress in the negotiation process, which is expressed by the readiness of the sides to introduce incident investigation mechanisms and expand the staff of the Personal Representative of the OSCE Chairperson-in-Office,'' Minasyan said.

However, according to the analyst, even if it is possible to introduce the mechanisms within the shortest period possible, that is exactly during the coming week, the talks of the Armenian and Azerbaijani leaders will encounter obstacles. Baku expects unilateral concessions from the Armenian side, but neither Yerevan nor Stepanakert are going to make such concessions, he added.