Drone Breaches Bulgarian Airspace, Explodes Near Romanian Border

A drone entered Bulgarian airspace from the direction of Romania early Saturday and exploded about 100 meters inside the border near the former Kardam border checkpoint, prompting authorities to strengthen surveillance and security measures along the country's northern frontier.

The incident occurred at around 8:10 a.m. near a sunflower field, about 200 meters from a Romanian compressor station and roughly 1 kilometer from a Bulgarian compressor station on the Trans-Balkan gas pipeline. No one was injured and there was no damage to buildings, infrastructure or the surrounding agricultural land.

Prime Minister Rumen Radev announced the incident after an extraordinary meeting of the Security Council at the Council of Ministers. He said the drone had entered from Romanian airspace but had not been detected either in Romania or Bulgaria. There was also no information from the Combined Air Operations Center in Torrejon, Spain, which monitors airspace across Southern Europe.

“This drone has not been detected or identified in Romanian airspace. Nor in our airspace,” Radev said, describing the detection of small drones flying at low altitude as a major challenge.

The aircraft was badly damaged in the explosion, making it impossible for authorities to immediately determine whether it was a civilian or military drone. Radev said, however, that “this is not a toy drone, it is larger.” Authorities are examining the wreckage to establish its exact type and whether it was carrying an explosive payload. The prime minister said it was too early to determine whether the incident was a deliberate attack.

The circumstances have raised particular concern because the incident follows a series of drone incursions in neighboring Romania, including the recent downing of three Shahed drones by the Romanian Air Force. Shahed drones are Iranian-designed systems widely used by Russia in its war against Ukraine, and Bulgarian authorities have responded to the developments by reinforcing surveillance along the border.

“As a result of what happened two weeks ago in Romania, three Shahed drones were shot down by the Romanian Air Force. We reacted immediately, so the Ministry of Defense strengthened radar coverage and surveillance capabilities in this area,” Radev said.

The Bulgarian Defense Ministry had already increased its monitoring of the region following the Romanian incidents. Additional forces and equipment have been deployed to deal with low-flying aerial targets, while radar coverage has been strengthened. Following Saturday's incident, Border Police resources will also be redeployed along the entire border, from Turkey to Romania, to improve the ability to detect and counter drones.

Defense Minister Dimitar Stoyanov said that, since July 31, Bulgaria has further reinforced its airspace protection with anti-aircraft missile systems, Cougar helicopters and Su-25 aircraft. Additional radar stations have also been deployed, while security measures around strategic facilities have been increased.

The authorities said the drone exploded and fell into a sunflower field. Regional Governor Ruslan Tomov visited the site and said there was no reason for public concern. Traffic through the nearby border crossing remains normal, with no restrictions imposed.

Tomov said the aircraft self-detonated before falling into the field and caused no damage to infrastructure or the surrounding land. Officials from the Defense Ministry and Chief of Defense Admiral Emil Evtimov arrived at the scene after the Border Police reported the incident, while specialists began examining the remains.

“Everything possible is being done to establish the type of drone,” Tomov said.

The location of the incident is particularly sensitive because of its proximity to energy infrastructure. The explosion occurred about 1 kilometer from Bulgaria's compressor station on the Trans-Balkan gas pipeline and around 200 meters from the corresponding Romanian facility.

Radev said the difficulty in detecting the drone highlighted long-standing gaps in Bulgaria's radar capabilities. Small aircraft flying at low altitude can evade existing systems because the country cannot maintain sufficient radar coverage to guarantee detection of every such target.

“The procedure for the delivery of modern, digital three-dimensional radars has been delayed for years, but the Ministry of Defense is doing everything possible to speed up the process of their delivery,” Radev said.

The incident comes after several serious drone-related episodes in Romania. In recent months, drones have entered Romanian airspace on multiple occasions, while one Ukrainian drone fell on a residential building in Galati and another exploded near the port of Constanta. At the end of July, drones entered Romanian airspace on four consecutive days, prompting Bucharest to discuss the possible activation of NATO's Article 4 consultation mechanism.

Bulgaria now plans to raise the incident at the next North Atlantic Council meeting. Radev said Poland will present information about ballistic missile incidents on its territory, Romania will discuss drones detected or shot down over its territory, and Bulgaria will present the case of the drone that exploded on Bulgarian soil.

Authorities have so far reported only one drone involved in the Bulgarian incident. Its origin, exact model and purpose remain under investigation, but the timing and circumstances have placed the case in the broader context of Russian drone activity in the region and the repeated appearance of Shahed-type drones near NATO airspace.