(DEFENCE SECURITY ASIA) — South Korean F-35A stealth fighters and French Rafales flew together from Cheongju Air Base during a September 15–17 exercise that tested whether a visiting European combat detachment could operate alongside Seoul’s fighters and draw on its aerial refuelling support.

The most consequential event was reciprocal refuelling: a French A330 MRTT Phénix supplied a South Korean F-35A through its flying boom, while a South Korean KC-330 Cygnus supplied French Rafales through its probe-and-drogue hoses, according to the exercise account.

Those connections matter because tanker compatibility affects how far a mixed fighter force can travel, how long it can remain airborne and whether a coalition can sustain sorties when a national tanker is unavailable or committed elsewhere.

The Cheongju exercise formed part of France’s PÉGASE 26 deployment, a planned journey of more than 40,000 kilometres through the Arctic, Indo-Pacific and Middle East involving four Rafales, three A330 MRTTs, two A400M transports and approximately 300 personnel.

Only two French Rafales and one Phénix participated in the South Korean stop, making the three-day drill a focused interoperability test within a wider French effort to move and sustain combat aircraft across distant operating regions.

For South Korea, hosting that detachment allowed its F-35As to practise support from a foreign tanker while exposing French crews to an air force that also operates F-15Ks, KF-16s and FA-50s in mixed fighter packages.

French PÉGASE commander General Julien Sabéné framed the deployment around the ability to intervene quickly and autonomously at long range; the Cheongju drill tested one practical condition behind that ambition: access to a partner’s aircraft and airfield.

During the broader exercise, South Korean and French aircraft also flew against a simulated opponent, giving crews an opportunity to coordinate formation timing and positioning across fighter types built around different operating concepts and support requirements.

The reported activities establish procedural cooperation in the air, but they do not establish that the F-35A and Rafale exchanged classified sensor data, integrated their mission systems or demonstrated a common combat network.

That distinction determines the exercise’s military significance: reciprocal fuel transfer and coordinated flying expand coalition options, while their effectiveness under hostile electronic warfare, air-defence pressure or sustained combat remains untested in the public account.

A formation flyover above the United Nations Memorial Cemetery in Busan connected the deployment to France’s Korean War role, placing a visible diplomatic signal alongside the less visible work of validating tanker and fighter procedures.

The result is a limited but meaningful addition to Indo-Pacific air-power planning: France gained experience operating through a South Korean base, while Seoul gained another practised partner without changing the central role of its United States alliance.

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Reciprocal Refuelling Tests the Coalition’s Endurance

On September 16, the South Korean KC-330 Cygnus reportedly refuelled two French Rafales simultaneously through probe-and-drogue hoses, requiring the fighter crews to maintain precise positions behind the tanker while connecting their probes to the trailing drogues.

The French Phénix, meanwhile, used its flying boom to refuel a South Korean F-35A through a receptacle on the stealth fighter’s upper fuselage, demonstrating a different tanker-to-receiver procedure within the same bilateral exercise.

These were separate technical tasks, and their combined value lies in giving planners evidence that each air force can support at least one fighter type operated by the other under the conditions practised at Cheongju.

A fighter package crossing the Indo-Pacific depends on available fuel at successive stages, so reciprocal tanker procedures can give commanders more ways to arrange transit, recover delayed aircraft or sustain a mission after schedules change.

That flexibility is especially relevant to France’s compact travelling force, whose Rafales must cross several regions alongside tanker and transport aircraft before they can conduct meaningful flying from a distant partner base.

For South Korea, receiving fuel from a French boom tanker demonstrates a potential support option for F-35A operations, although one successful exercise cannot establish routine access, available tanker capacity or wartime permission to use it.

Both tankers derive from the Airbus A330, yet compatible aircraft alone do not produce an effective refuelling operation; crews must coordinate clearances, positions, communications, emergency procedures and the timing of multiple receivers.

The reported refuelling events therefore addressed a concrete coalition problem: different national fleets can share fuel in flight only when their equipment, trained crews and agreed procedures function together at the required place and time.

No public account provided sortie-generation figures, repeated refuelling rates or evidence of operations under attack, leaving the exercise’s contribution to sustained combat endurance narrower than its successful individual connections might suggest.

Even with that limit, aerial refuelling was the clearest operational gain at Cheongju because it linked French and South Korean support fleets directly to combat aircraft whose useful reach depends on reliable access to tankers.

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Mixed Fighter Flights Probe the Limits of Interoperability

South Korean F-35As and French Rafales reportedly flew a five-aircraft formation against a simulated adversary, while F-15Ks, KF-16s and FA-50s joined the wider exercise package from Cheongju’s existing fighter force.

That mix matters to coalition planning because visiting Rafales would rarely operate in isolation during a regional contingency; they would need to share airspace, schedules and tactical responsibilities with aircraft carrying different sensors and weapons.

The simulated opposing-force scenario allowed crews to practise positioning and timing, two basic requirements for preventing friendly aircraft from obstructing one another while concentrating force against a common tactical problem.

Pilot exchanges after the flights added a second layer of value by comparing how crews employ their aircraft, though discussion and coordinated flying cannot by themselves demonstrate that separate mission systems deliver a shared tactical picture.

The F-35A’s presence made the exercise especially relevant to fifth-generation coalition operations, but the available account describes flying and refuelling procedures rather than verified fusion between the stealth fighter and the French Rafale.

Operational planners should therefore read the result as improved familiarity between aircrews, controllers and tankers, with any claim about integrated targeting or secure datalink performance requiring evidence beyond what was publicly reported.

Cheongju also tested the practical demands of receiving a foreign detachment, including aircraft parking, servicing and flight scheduling, because a visiting fighter contributes little regional reach if its host base cannot support sorties.

The wider South Korean fighter package gave French crews exposure to several aircraft types operating from one base, a useful setting for rehearsing how a small external contribution fits into a larger national force posture.

At the same time, two visiting Rafales provided too small a sample to measure how a larger French contingent would affect airfield capacity, maintenance demand or the tempo of South Korean combat operations.

The exercise consequently advanced the procedural foundations of mixed-force flying while leaving the harder questions—secure information exchange, repeated sortie production and combat performance in contested airspace—outside the publicly established result.

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PÉGASE 26 Puts Logistics at the Centre of French Reach

France designed PÉGASE 26 around a travelling package of four Rafales, three Phénix tankers and two A400M transports, a force structure that makes fuel, cargo movement and access to airfields central to its combat-aircraft deployment. 

Its planned route runs from France through Greenland, Canada and Alaska before reaching Indo-Pacific partners and later Middle Eastern stops, testing whether the same package can move through markedly different geographic and operating conditions.

French defence reporting identifies the Greenland-to-Alaska leg as a new northern approach to the Indo-Pacific, giving Paris another route whose utility depends on overflight arrangements, functioning support points and tanker availability. 

On the initial transit to Alaska, the Rafales required six aerial refuellings during approximately eleven hours of flight, illustrating how quickly long-range fighter projection becomes a question of tanker scheduling rather than fighter performance alone. 

The A400Ms carry the personnel and equipment that make a distant arrival operationally useful, while the Phénix tankers enable the fighters to cover long legs and retain more options when flight plans change.

French air operations staff at Lyon-Mont-Verdun directed and monitored the mission remotely, adding command coordination to a deployment whose aircraft and crews moved through multiple national airspaces and host facilities. 

The Cheongju stop tested a further dependency within that chain: whether the travelling force could work with a partner’s base and tanker fleet instead of relying exclusively on the aircraft and equipment it brought from France.

That support model may reduce the footprint required for a short visit, but its utility in a crisis would still depend on host-nation consent, available fuel and repair capacity, and the security of the airfield.

Later stops involving Rafale-operating countries also place the French fighter within a broader network of partners, although shared aircraft types alone do not establish common command arrangements or guaranteed access during a conflict.

PÉGASE 26 thus demonstrates an approach to air-power reach built around a small deployable force, successive support points and partner cooperation, with Cheongju providing one concrete test of that logistics footprint.

South Korea Gains a Partner Without Changing Its Core Posture

South Korea’s immediate operational interest was narrower than France’s global deployment: Cheongju gave its fighter crews experience with a French combat detachment and its F-35A crews a chance to receive fuel from a French tanker.

That experience expands Seoul’s familiarity with another capable air force, but three days of activity and two visiting Rafales cannot materially alter the force balance on the Korean Peninsula or substitute for established defence arrangements.

France, in turn, gained experience using a South Korean air base near one of Northeast Asia’s most demanding security environments, demonstrating access without establishing a permanent French combat-aircraft presence there.

The exercise followed a September 8 visit to Paris by South Korean President Lee Jae-myung, during which the two governments discussed closer defence and logistics cooperation, according to the account accompanying the original article.

If those discussions produce workable information-protection and mutual logistics arrangements, they could make future exercises easier to plan, though the Cheongju flights alone cannot show that such arrangements have been concluded or tested.

The flyover above the United Nations Memorial Cemetery in Busan gave the visit a historical and political dimension, drawing attention to France’s Korean War contribution while the air forces conducted practical cooperation elsewhere.

For Seoul, the strategic value lies in having more trained relationships and support options available to planners, provided those options remain compatible with the requirements and commitments that govern South Korean operations.

For Paris, cooperation with South Korea supports its claim to an active Indo-Pacific role, yet the scale and duration of the deployment set clear limits on what French aircraft could contribute to any regional contingency.

The two countries’ defence industries may also compete for international customers, so closer military contact should be assessed on its demonstrated operational results rather than treated as proof of broad strategic alignment.

Cheongju shows a modest widening of defence cooperation: a foreign tanker served a South Korean stealth fighter, South Korean support served French Rafales, and both air forces gained procedures they can examine in future planning.

What the Exercise Proved—and What Remains Open

The clearest verified outcome in the provided account is that the two air forces practised reciprocal refuelling and combined fighter flights during France’s three-day South Korean stop, with a separate Busan flyover marking the visit.

Those activities support a measured conclusion about procedural interoperability, because crews successfully connected aircraft and coordinated flying, but they do not demonstrate the performance of the combined force in a contested battlespace.

No live-fire event, classified mission-system integration or sustained combat deployment was reported, so claims about common targeting, survivability against advanced air defences or prolonged coalition sortie rates would exceed the available evidence.

The exercise also leaves open whether either side could supply enough tankers during a larger operation, when aircraft availability, maintenance cycles, national priorities and competing missions would constrain support more severely than in a scheduled drill.

Airfield access presents a parallel question: Cheongju hosted a small French detachment, while any larger or longer deployment would require more parking, maintenance support, fuel, transport capacity and protection for personnel and aircraft.

France’s new northern transit route gives planners another demonstrated path toward the Indo-Pacific, but a usable route in an exercise does not guarantee that every overflight, tanker or landing option remains available during a crisis.

The regional signal is therefore specific rather than sweeping: France showed that it could bring a compact combat-aircraft element to South Korea, and Seoul showed that its air force could operate and refuel alongside it.

For defence planners, the next useful evidence would be repeated reciprocal refuelling, more demanding mixed-force missions and clearer information on how both air forces coordinate command decisions across their different aircraft and support systems.

For policymakers, the exercise illustrates how modest deployments can build military options through logistics and practiced procedures, while their political and operational value still depends on access decisions made before and during a crisis.

Cheongju did not redraw the Indo-Pacific air-power balance, but it gave France and South Korea a tested starting point for cooperation in the two areas that made the visit consequential: fighter coordination and shared tanker support.