Rumor has that Russia has invited China to be "partners" in the early time of Pakfa, China turned that down, then India was invited in. What would have changed that makes Su-57 more attractive today than the past?Well, if the Indians are, in fact, out, this presents an excellent opportunity for the Chinese to get in! Hey, they purchased 24 Su-35, why not 24 Su-57 as well? What’s the price difference? If the Su-57 is supposedly half the price of the F-35, it can’t be that much more than the Su-35. According ti Wikipedia’s sources, they’re what and what (although this is somewhat incredible, to me).
I imagine that your argument is based on the assumption that Su-57 may cost just slightly higher than Su-35, that higher cost worth the VLO. But problem is that Su-35 in PLA is a stop-gap, something PLA prefer not to have but have to have right now before J-20 enters service in large number.
Last, but most importantly, Russia has finished the development of Su-57, what India dropped out is the FGFA (the twin seated variant) of Su-57. There is no benefit (gaining knowledge) for China to get in, except paying the Russians for their work, that is a big no-no.
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