Two US refueling aircraft depart Bulgarian air base following regional Iranian threats

Departure from Bezmer Air Base

Two United States Air Force KC-135 Stratotanker refueling aircraft departed Bezmer Air Base in southeastern Bulgaria on Friday, 21 August. Bulgarian Minister of Defense Dimitar Stoyanov announced the conclusion of the mission during a briefing with reporters on Saturday, 22 August. The deployment had lasted approximately one month following authorization by the Bulgarian Parliament on 22 July. Washington had requested the temporary stationing under an existing bilateral agreement regulating the shared use of military facilities. The deployment occurred against the backdrop of the armed conflict between the United States and Iran, which commenced on 28 February. United States military authorities did not issue an immediate public comment on the aircraft departure.

We work in full coordination with the US government and had prior information, which is why all our decisions were well founded.

Iranian warnings and domestic safety concerns

The arrival of the American tanker aircraft in late July generated sharp diplomatic backlash from Tehran, which accused Sofia of facilitating military operations. Iranian authorities declared that hosting the refueling assets constituted complicity in aggression and war crimes, an assertion that the Bulgarian government formally rejected. The deployment also triggered protests from residents living near the Bezmer facility, who voiced fears that the base could become a target for Iranian ballistic missiles and armed drones. Stoyanov addressed these concerns by stating that all flights executed by the KC-135 aircraft during their deployment consisted of training missions conducted over allied airspace. The defense minister maintained that Bulgarian intelligence possessed no evidence of direct threats targeting national security.

NATO collective defense guarantees

Regional security anxieties intensified following reports that Iranian planners were evaluating retaliatory strikes against American assets across southeastern Europe, specifically highlighting bases in Bulgaria and Cyprus. To address potential spillover, NATO Secretary General Mark Rutte conducted a telephone conference with Bulgarian Prime Minister Rumen Radev on 20 August. Rutte assured the Bulgarian leadership that any potential attack by Iran against Bulgarian territory would immediately activate the collective defense mechanisms outlined in Article 5 of the North Atlantic Treaty. A statement released by the government in Sofia indicated that Rutte personally confirmed the operational readiness of allied forces in the region to intercept and neutralize external threats.

Regional tensions along NATO's eastern flank

Bulgaria is not the only Black Sea nation to draw warnings from Tehran regarding American military infrastructure. In spring, Iranian diplomatic officials issued formal warnings to neighboring Romania following its decision to assist American military logistics. The Romanian government had approved a United States request on 11 March to host aerial refueling aircraft, surveillance equipment, and satellite communications systems for Iran-related operations. In response, Iranian Foreign Ministry spokesperson Esmaeil Baghaei asserted that facilitating foreign military assets violated international legal standards and imposed direct legal responsibility on Bucharest.

If Romania puts its bases at the disposal of the United States, this would be equivalent to participating in a military aggression against Iran.

The withdrawal of the two KC-135 aircraft ends a sensitive chapter in Bulgarian defense cooperation as regional allies monitor broader Middle Eastern escalation risks.