https://www.armyrecognition.com/news/aerospace-news/2025/uk-tries-to-help-south-korea-avoid-us-veto-on-kf-21-export-by-replacing-f414-engine-with-british-one
>Given this skepticism, the British government has stepped in to propose Rolls-Royce as a co-development partner, offering an intermediary step before full domestic capability is achieved. British officials argue that such a collaboration would de-risk the program, expedite development, and establish a durable industrial relationship. Rolls-Royce has publicly expressed interest in contributing to other nations’ combat aircraft capabilities and is simultaneously pursuing a similar co-development deal with India for the AMCA program. While Rolls-Royce has not commented officially on the KF-21 project, it has emphasized the strategic benefits of co-creating intellectual property, allowing partner countries to maintain full operational sovereignty and export flexibility.

>Rolls-Royce’s proposal does not center on selling an off-the-shelf engine like the EJ200, which powers the Eurofighter Typhoon, but rather on co-developing a new engine that could surpass the F414 in terms of both thrust and efficiency. This proposed engine, which may also benefit from technological synergies with the UK-Japan-Italy Global Combat Air Programme (GCAP), would be built from the ground up with South Korean partners and would include full intellectual property transfer. Rolls-Royce has offered a similar model to India for its AMCA fighter, with a target thrust level of around 110 kN.

I see no point in this cooperation since this is an obvious bait and switch tactics.