According to preliminary data, Mayor of Yerevan Yervand Zakharian will take part in the Third International Congress of Mayors of the World to be held in Moscow on September 16-17. The Congress participants are expected to discuss the role of cities in the 21-th century and the interaction of the youth as a factor of strengthening peace and trust between residents of cities. Mayors of over 100 cities and leaders of a number of international organizations will be invited to the Congress. To note, the meeting is organized within the frames of city diplomacy development.