Project Tempest seems to be garnering a lot of interest among several countries who do not want to collaborate directly with the United States or Russia.
Case and point, Japan and India for the next generation engine development from this project, while Turkey showing interest for the main program.
There were discussions online that mention that the UK is
inviting Japan for the development of the next-generation engine for the Tempest and the Mitsubishi F-3 (Shin-Shin). Similarly, The decision to establish a collaboration will be decided by India for AMCA with
either Rolls-Royce or Safran in February 2022.
If these reports are true, then it would be the first time that the British are collaborating outside their traditional western sphere of alliances
Turkey has also
shown interest in collaborating with UK for their own TF-X project. No idea how far the talks have progressed.
Perhaps our Turkish members
@Hakikat ve Hikmet @TurDef here could highlight the details.