Bulgaria sends troops to Romanian border after drone explosion near gas station

Bulgaria's prime minister announced troop mobilization at the Romanian border after a drone exploded near a gas station, allegedly coming from Romanian airspace. The explosion occurred about 1,000 meters from a gas compression station near Kardam, part of the Vertical Gas Corridor. Neither Bulgarian nor Romanian authorities had detected the drone before it exploded. Kardam is a key location on the corridor, which is important for regional gas transport. The incident raises concerns about border surveillance and energy infrastructure security.