A drone made by a Bulgarian military student team is pictured during the Military Student Multirotor Fest, near Bucharest, Romania, April 28, 2026. Military students from Bulgaria, France and Romania participate in the 3-day event, competing with their self-built equipment to demonstrate their technical and piloting skills. (Photo by Cristian Cristel/Xinhua)

A member (C) of a Bulgarian military student team operates a drone during the Military Student Multirotor Fest, near Bucharest, Romania, April 28, 2026. Military students from Bulgaria, France and Romania participate in the 3-day event, competing with their self-built equipment to demonstrate their technical and piloting skills. (Photo by Cristian Cristel/Xinhua)

A member (C) of a Bulgarian military student team operates a drone during the Military Student Multirotor Fest, near Bucharest, Romania, April 28, 2026. Military students from Bulgaria, France and Romania participate in the 3-day event, competing with their self-built equipment to demonstrate their technical and piloting skills. (Photo by Cristian Cristel/Xinhua)

Members of a French military student team operates a drone during the Military Student Multirotor Fest, near Bucharest, Romania, April 28, 2026. Military students from Bulgaria, France and Romania participate in the 3-day event, competing with their self-built equipment to demonstrate their technical and piloting skills. (Photo by Cristian Cristel/Xinhua)