Why is Turkey concerned about the Brussels meeting?

Turkey condemns the tripartite meeting between Armenia, the EU and the U.S. in Brussels, arguing that it will become an obstacle in the way of settling complex issues in the region. Turkey notes that this meeting comes as a blow to the possible peace between Armenia and Azerbaijan. Although the Armenian side claimed that the meeting was going to center on economic issues, the Turkish side did not find this claim convincing. What are Turkey’s interests in this regard and why is it concerned? Details in the video: