BTW, this is how china supports russia, and RUR-CNY:RUR dropped roughly 25%, so the price is right. Meanwhile, the RMB USD band is holding on pretty well at 7.1 vs 6.7-7 range.
The other advantage of Su-35s is that Su-35s can easily integrate Russian weapons. The R-37M, for instance, is a very impressive interceptor missile with 400 km range, whereas we only have a minimum maximum range of 200 km for the PL-15. Russian missiles are arguably more advanced than Chinese missiles in the engine sector, so having platforms to integrate Russian missiles means that Western ECM will have to combat two differing combat philosophies at the same time, as well as face different missile designs.
How on earth do you now the PL-21 isn't in service yet. It's been photographed for years. For all we know it could have even been retired by now! lol Of course being serious, your idea is right but the R-37 would need to be carefully evaluated first. You automatically assume it's perfect while assuming an old PLAAF missile isn't even in service.Problem is, the PL-21 isn't in service yet. The R-37M is a nice back-up system in the event that the PL-21 or whatever PL-XVR missile takes longer to mature than expected.
Just saying, while the Su-57 is a disappointment to an extent (it's basically F-22 and F-35s for broke people), the Russian missile development complex is still impressive. A variation of the Kinzhal adapted for the Su-57 could see service on the Su-35, when the direction the Chinese are going in is a DF-21 adapted for the H-6. Likely, the Kinzhal variants will have far inferior range to an air-launched DF-21, but can be mounted on smaller platforms.
You have to remember, there's holes in Chinese missile arsenals. There's the PL-10, but there's nothing known to be comparable to the American micromissile suite, and while there's the PL-21, it's more vaporware than the R-37M.
Put another way, is it a strength or a weakness that American fighters don't run Meteor? The Meteor missile has incredible capability, especilaly when compared to AIM-120Ds, given its ramjet power, but the Americans don't use it. Why? Because it's not an American missile and the American MIC will scream.
China should not have the same problem. If a foreign system can do a job better than a domestic system, and there's domestic redundancies in the event of embargoes or sabotage, it should use the foreign system with the domestic system as a back-up.