US military planes depart Bulgaria after a month-long deployment that drew sharp criticism from Iran and sparked debate within the NATO member state. Two US Air Force KC-135 Stratotanker aerial refueling aircraft left Bezmer Air Base on Friday, August 21, 2026, departing earlier than their authorized stay .
Bulgarian Defense Minister Dimitar Stoyanov confirmed the departure on Saturday, August 22, stating that the aircraft had flown out of the southeastern Bulgarian base . The planes were among up to eight KC-135 refueling tankers that Bulgaria’s parliament had approved for temporary deployment on July 22, with authorization running from July 24 through October 1, 2026 .
Why Did US Military Planes Leave Bulgaria?
The departure of the US military aircraft from Bulgaria comes as the mission’s stated purpose—providing logistical support for US operations in the Middle East—appears to have concluded. A US Air Force spokesperson confirmed that the Boeing KC-135 Stratotankers departed to support “other operational requirements” .
Stoyanov emphasized that US military planes left Bulgaria following close coordination between Sofia and Washington. “We worked in exceptional synchrony with the US government and had preliminary information. All our decisions were based on accurate and clear information, not on conspiracy theories,” the defense minister said .
Bulgarian President Rumen Radev also addressed the departure, telling reporters that the tanker aircraft “have not made a single flight south” during their stay. The only flights conducted were to NATO countries north and west of Bulgaria for exercises and training .
The Deployment: What Happened at Bezmer Air Base?
The US KC-135 planes in Bulgaria arrived at Bezmer Air Base on July 31, 2026, following a parliamentary vote that authorized the temporary stationing of up to eight refueling aircraft and 250 US military personnel . Bezmer Air Base, located approximately 150 miles southwest of Sofia, is a joint-use facility requiring Bulgarian parliamentary approval for each US deployment .
Under the approved mission, the aircraft were to provide logistical support for US operations in the Middle East. However, only two of the eight authorized planes were ever deployed to the base .
During their stay, Stoyanov confirmed that “not a single flight was conducted in a southerly direction” toward the Middle East . All missions were described as training flights conducted over allied countries’ airspace to the west and northwest .
Iran’s Response: Warnings and Condemnation
The deployment of US military aircraft in Bulgaria drew immediate and repeated warnings from Tehran, raising regional security concerns.
Iranian Foreign Ministry spokesman Esmail Baghaei had warned in July that Bulgaria’s decision to host US military assets “may constitute an act of aggression” . Following the aircraft’s departure, Baghaei reiterated Iran’s position that the deployment violated international law and amounted to support for US and Israeli military operations against Tehran .
“Iran has information that several US KC-135 tanker aircraft have left Bulgaria,” Baghaei said at his weekly press conference, according to Iran’s state news agency IRNA. He stressed that Tehran considers itself entitled under international law to respond to the source of what it deems aggression .
However, Baghaei also drew a distinction between the Bulgarian government’s actions and the Bulgarian people, stating that Iran had taken note of Bulgarian political positions opposing the use of the country in the conflict . He warned that countries should not make their territory available to the United States, but noted that “countries have no reason to worry about the Islamic Republic unless they have made their territory and facilities available to the United States” .
Regional Security Context and NATO Concerns
The deployment of US planes to Bulgaria occurred against a backdrop of heightened tensions between the United States and Iran. Reports had suggested that Iranian forces were assessing options for strikes against US assets in Southeastern Europe, including in Bulgaria, following the approval of Bezmer Air Base for refueling operations .
Bulgarian officials consistently maintained that there was no direct threat to national security. Stoyanov said Bulgaria “received no information about a direct threat to national security” , while Prime Minister Radev told reporters he did not believe Bulgaria was under threat .
The deployment also sparked domestic political debate in Bulgaria. GERB leader Boyko Borissov criticized the government’s handling of the situation, arguing that the aircraft should have been based at Sofia’s airport to avoid controversy . Local residents near Bezmer had also voiced concerns, with some collecting signatures against the presence of US aircraft and expressing fears that the base could become a target amid US-Iran tensions .
FAQ: US Military Planes Depart Bulgaria
Why did US military planes leave Bulgaria?
The two KC-135 tanker aircraft left Bezmer Air Base on August 21, 2026, after completing their deployment. A US Air Force spokesperson stated they departed to support “other operational requirements” . The mission was approved to provide logistical support for US operations in the Middle East .
When did the US planes leave Bulgaria?
The US military aircraft departed Bulgaria on Friday, August 21, 2026, departing earlier than the October 1 deadline authorized by Bulgaria’s parliament .
What type of US aircraft were in Bulgaria?
Two US Air Force KC-135 Stratotanker aerial refueling aircraft were stationed at Bezmer Air Base . Bulgaria’s parliament had authorized up to eight such aircraft, but only two were deployed .
Why was Iran upset about US planes in Bulgaria?
Iran warned that hosting US military assets could constitute participation in aggression against Iran . Iranian officials said the deployment violated international law and provided support for US and Israeli military operations against Tehran .
Did the US planes fly missions against Iran from Bulgaria?
No. Bulgarian Defense Minister Dimitar Stoyanov and Prime Minister Rumen Radev both confirmed that “not a single flight was conducted in a southerly direction” during the aircraft’s stay. All missions were described as training flights over NATO countries to the north and west .
Is Bulgaria still hosting US military aircraft?
As of August 22, 2026, the two KC-135 tanker aircraft have departed Bezmer Air Base. It remains unclear whether additional aircraft will be deployed, though the parliamentary authorization technically remains in effect until October 1.