@sepheronx
It is used and even in SMP, like navigation system АРБИС... you have to remember, they have the HW, like you mentioned, but rewriting software is even more pain thus there are still things made on x86 for them, prolly could be even stolen from someone. MIPS and RISC are hard to code as not many coders are coming really out of the old SPARC institute... and like ones you can trust on. Also those are way too performant and HOT to be resided mil/space grade device, and they are way to young. It will take years to have a working and tested equipment, without catching fire... but... they catch fire either way... I have no information how radiation hardened are new Russian CPU's despite being on higher tech node, but that does not guarantee anything. They boosted a lot of tech, because of tech exchange deal with China, but you have to take all the achievements with a bucket salt, no a cistern of salt and ignore all the links and media reports, because of corruption and propganda, you an only trust things you see with your own two eyes about them.
You are right about Indians, but the obvious why is the localization and they use different arsenal and components for their Su-30MKI. Who will code for those Russian CPU? Indians? How? They chose their solutions backported from earlier prolly HAL Tejas for their radar/rocket/navigation/comms etc variety. IMHO their export variants reside on x86 for sure.