A suspected Iranian plot to strike precious B-1 bombers stationed in Britain has laid bare a critical weakness in NATO's defensive architecture: the alliance's air bases remain far from capable of withstanding drone attacks.

U.S. officials said intelligence was obtained indicating Iran planned to use drones and other devices to strike the bomber fleet, prompting more than a dozen B-1 bombers to scramble out of Royal Air Force Fairford. Last month, five men were arrested in woods near the base on suspicion of plotting a terrorist attack, and related fears escalated sharply. After the aircraft were withdrawn, Trump told reporters earlier this week: "We saw there was a potential threat, so why would I leave the warplanes there?"

Whether Iran actually possesses the capability to carry out such an attack remains undetermined, but the episode amply demonstrates that technological advances and shifting forms of warfare are upending long-established operational strategies. Britain's outdated laws restrict the military's ability to shoot down drones in public airspace, and combined with the technological upgrading of drones themselves, this means military aircraft once parked inside wire fences, far from war zones and considered safe, are now highly vulnerable to opportunistic attacks.

Britain is not alone in facing this problem. Military bases in many parts of the world have become such soft targets. In earlier Iranian attacks on a U.S. naval base in Bahrain, drones and missiles were also used to strike at least 20 American facilities in the region, including military and diplomatic sites. In the aftermath, the Pentagon is reassessing its entire troop posture in the Middle East. The main facilities of the Middle East air operations command headquartered in Qatar suffered severe damage. U.S. bases in Germany, Italy and Spain also have defensive gaps, which would disrupt the Pentagon's concept of using Europe as a "power projection platform" for military intervention.

The risk of drone intrusions has likewise spread to the U.S. homeland. In March this year, small drones flew over Barksdale Air Force Base in Louisiana. The base hosts a large number of B-52 bombers and is also home to the Global Strike Command that oversees U.S. bomber fleets and intercontinental ballistic missiles. Because of the unidentified drone incursion, the base briefly issued a shelter-in-place order, though no attack occurred.

Recognizing the rising risks at bases at home and abroad, the U.S. Air Force recently said it will invest in new counter-drone systems and train specialized operators. U.S. Air Force Chief of Staff General Kenneth Wilsbach said last month that such defensive work has now become a "core function of air and space power."

Britain faces some unique difficulties: under British law, only police and prison officers may interfere with or shoot down drones in public airspace. That means military personnel alone cannot intercept drones before they enter the boundaries of a military base. At the same time, today's drones can rely on mobile phone networks or fiber-optic communications, evading police's traditional radio-frequency jamming methods. Mike Monnik, chief executive of global drone threat monitoring organization DroneSec, said: "Russia, and very likely Iran, have discovered this major defensive gap."

The B-1 bombers parked at Fairford have fuselages 146 feet long, making them highly attractive targets. The United States keeps only about 45 of this bomber type, each costing hundreds of millions of dollars. Not long ago, more than a dozen B-1s were still parked in the open at this air base northwest of London. Unlike fighter jets, this aircraft type is enormous and very difficult to store in hangars or hardened shelters.

The British government says security at its bases is under control and is pushing to amend the law so that base guard troops can track, jam and even shoot down drones at long range. Britain has also announced about 470 million pounds (US$620 million) in spending to improve military base security. The Fairford incident is the latest case of asymmetric warfare: a lopsided gap in military strength between the two sides. Five hooded suspects, whose methods appeared clumsy, were arrested in woods near the base with three vans and several fuel drums seized at the scene, yet they forced the United States to pull bombers back thousands of miles away from the Iranian front.

If the episode was indeed orchestrated by Iran, it amounts to a low-cost victory for Tehran. It has also dealt a heavy blow to Britain's reputation: since World War II, the United States has long flown heavy bombers from Fairford on missions. The five arrested have not yet been criminally charged and are on bail, but British Prime Minister Andy Burnham said there are indications Iran was involved. Greg Bagwell, president of the British Air and Space Power Association, said: "In the past, when we defended airfields, the threat came either from long-range bombing or from armed personnel climbing over wire fences to infiltrate. Now we face a new threat somewhere in between."

Ukraine has claimed that using drones costing about US$2,000 each, it severely damaged 41 aircraft worth a total of US$7 billion at four Russian military bases. In the operation codenamed "Operation Spider Web," Ukraine smuggled drones into Russia and launched them remotely to attack air bases deep inside Russian territory. The strike not only inflicted military humiliation on Russia but also delivered a huge public-opinion victory for Ukraine.

Security officials are skeptical about whether Iran could replicate "Operation Spider Web." Iran's record of terrorist activity in Britain mostly involves hiring local criminals to attack dissidents or arson attacks on Jewish-related targets. Nevertheless, British Defense Minister Luke Pollard admitted this month at a conference forum that Britain has underinvested in protecting military bases from drone attacks. British Ministry of Defense data show that in 2025 there were more than 250 drone incidents around British military facilities, double the number in 2024. In 2024, unidentified drones were found near U.S. bases in Britain including Royal Air Force Lakenheath, Royal Air Force Mildenhall and Royal Air Force Fairford. The drones flew in groups of up to 20, some passing low over runway approach airspace. Lakenheath hosts U.S. Air Force fourth- and fifth-generation fighter jets; Mildenhall is home to the U.S. Air Force's 100th Air Refueling Wing.

The British military classified these sightings as suspicious and dispatched teams equipped with drone jamming equipment to the bases, including AUKUS counter-drone systems capable of remotely seizing control of enemy drones. A report by the International Institute for Strategic Studies concluded that these drones were most likely launched by Russia from ships in the North Sea. Previously, European concerns about drone security focused mainly on suspected Russian drone launches over military bases for reconnaissance or to disrupt flight paths. But this summer the situation escalated further: Germany accused Russia of plotting to deploy an explosive drone at an airport in Leipzig. German investigators seized three custom-built drones in a foiled attack: two found in open country and one at the airport boundary near a Ukrainian-owned cargo plane. Investigators said the drones supported remote launch.

At this stage, defense relies heavily on intelligence agencies intercepting leads before attackers act. Monnik believes Britain could deploy more advanced drone jamming equipment, but ultimately some low-cost, simple and effective solutions are equally viable: park warplanes in hangars with doors that can be closed. For large bombers, if indoor storage is difficult to achieve, they can be deployed to locations that are harder to reach. Greenland, for example, is one option.