The United States has redeployed at least 30 aerial refuelling aircraft from domestic bases to locations in Europe over the past three days, according to flight tracking data.
The movements come amid heightened speculation over potential military action against Iran, following a recent escalation in Israeli strikes on suspected Iranian nuclear infrastructure.
The aircraft involved are all KC-135 Stratotankers, a long-serving platform used to refuel fighter jets and bombers mid-flight. At least seven of the tankers made stopovers at US military facilities in Spain, Scotland, and England before heading eastwards. Flight data showed the planes flying near Sicily on Tuesday, with one confirmed to have landed on the Greek island of Crete.
While the US Department of Defence has not issued a public statement on the redeployments, defence analysts suggest that the movements indicate preparation for possible extended operations in the Middle East. Justin Bronk, senior research fellow at the Royal United Services Institute (RUSI), described the activity as “highly unusual”, noting that such a concentration of tanker aircraft suggests contingency planning for “intensive combat operations”.
The movements coincide with ongoing military activity involving Israel and Iran. On Friday, Israel reportedly launched a strike targeting Iran’s nuclear infrastructure, the latest in a series of tit-for-tat operations between the two states. The Israeli operation came just one day after US President Donald Trump’s deadline for Iran to accept a revised nuclear deal passed without agreement.
In parallel with the tanker deployments, three US defence officials confirmed to Reuters that F-16, F-22, and F-35 fighter aircraft have been positioned at bases across the Middle East. These platforms are reliant on aerial refuelling to maintain extended mission duration and range, indicating the strategic role of the relocated KC-135s.
There are also indications of wider US naval repositioning. The aircraft carrier USS Nimitz, previously operating in the South China Sea, has been redeployed towards the Middle East. MarineTraffic tracking data placed the Nimitz in the Malacca Strait on Tuesday, heading towards Singapore. The ship had been scheduled to take part in an event in Vietnam, but this was cancelled due to what the US embassy in Hanoi termed an “emergent operational requirement”.
The Nimitz carries a full complement of carrier-based strike aircraft and is escorted by guided missile destroyers, providing the US with additional force projection capabilities in the Gulf region.
Commenting on the developments, former Irish Defence Forces chief Vice-Admiral Mark Mellett stated that the redeployments could be part of a deliberate campaign of “strategic ambiguity”, aimed at pressuring Tehran into making concessions in nuclear negotiations. Nevertheless, he acknowledged the scale of the US military activity indicated preparation for potential high-intensity conflict.
Any strike against Iran’s nuclear infrastructure would likely require the use of highly specialised munitions. The only known conventional weapon capable of penetrating Iran’s most heavily fortified sites – such as the underground facility at Fordo – is the GBU-57A/B Massive Ordnance Penetrator (MOP), a 13,600 kg “bunker buster” bomb.
This weapon can only be deployed by the B-2 Spirit stealth bomber. While a squadron of B-2s was previously stationed at Diego Garcia, a remote US military base in the Indian Ocean, recent satellite imagery suggests the aircraft are no longer visibly present there. However, former RAF deputy operations chief Air Marshal Greg Bagwell noted that the B-2 is capable of round-trip operations directly from the continental United States.
“The aircraft could fly from the US, strike a target in Iran, and return — without needing to land,” Bagwell said. “You would be able to maintain a sustained operation from Diego Garcia far more efficiently, but the absence of B-2s on the island remains a missing piece of the jigsaw.”
Speculation over US involvement has grown following a statement by Vice-President JD Vance, who wrote on social media that President Trump “may decide he needs to take further action” to eliminate Iran’s nuclear capability. Vance’s remarks were widely interpreted as a signal that the administration is actively weighing military options.
Iran’s nuclear infrastructure includes the facilities at Natanz and Fordo, both of which are constructed underground. Natanz has previously been subject to Israeli sabotage operations, while Fordo, located near the city of Qom, remains heavily fortified within a mountain complex.
While the Biden administration, in its final year, pursued multilateral diplomacy with Iran, President Trump has reverted to a more unilateral posture since returning to office in January 2025. His administration’s recent moves suggest a willingness to escalate militarily if diplomatic outcomes are not achieved.
The current military posture, involving repositioned tanker aircraft, advanced fighter jets, strategic bombers, and a carrier strike group, gives the US significant operational flexibility. Whether this capability will be used remains uncertain, but the scale of preparation suggests a scenario in which military action is no longer theoretical.
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