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Bulgaria's Foreign Ministry summoned Ukraine's ambassador after a suspected Ukrainian drone exploded near a compressor station on the Trans-Balkan gas pipeline on Bulgarian territory. The incident raised concerns in Sofia about the safety of critical energy infrastructure and about the spillover of the war beyond Ukraine's borders into NATO and EU member states. Bulgarian officials sought an explanation from Kyiv over the apparent stray or errant unmanned aircraft, which caused an explosion near the facility. The Trans-Balkan pipeline is part of the regional gas transit network, and damage to compressor stations could disrupt supplies. The episode adds friction to relations between the two countries at a time when Ukraine is conducting extensive long-range drone operations against Russian energy targets.