Because the war in Ukraine is draining gov. funds and obviously not going very well. The EAF also asked to install the Su-57's AESA radar to compensate and that made matters worse because they don't even have the cost to build enough of those to push the Su-57's program faster for the VVS. So they certainly won't put them in the EAF's Su-35's. At least that's the prevailing rumor.
And the EAF should most certainly not accept them without a fully functional AESA. if you remember, I mentioned a while back that the IRBIS-E was not what the Russians touted it to be as far as a hybrid PESA/AESA. It functions a lot more in PESA mode despite tracking more targets than other 4th gen AC. It still gives up its location because of its great detection distances making its BVR resistance a bit suspect unless the pilot uses its range quick enough to fire first. Still, with the EAF so pleased with the Rafale's RBE2 AESA, they want the same or better for the Flanker Es which is a good stand. Especially when they got shafted on the MiG-29M/M2's radar upgrade to the Zhuk-AE as Russia promised and never delivered for several years now.
Problem is, what's the EAF's alternative besides Korea's KFX which is still at least 5 years away? Use another manufacturer's radar? Complicated and super costly proposition that is almost impractical because it's not just the radar that would need to be changed, Computer and all sorts of other elements making not worth the cost whatsoever. Almost makes the F-15 a much better option at this point, sadly.
Still looks like a beast from hell!
An absolute disgraceful embarrassment. The Russians are asking where are the frames going to end up! They're worried the US will scoop them up. Imperative the EAF run some major destruction method ASAP IMO so that doesn't happen.