Putin already offer Xi for PD8 and PD14 usage on C909/ARJ21 and C919. This as potential China also need to build non western version of their airliners as Russia already force to do with domestic version of SSJ-100 and MC-21. Both of them should put their ego and work closely better, if they really hope to get chances against Duopoly.
In the Cold War the Soviets had a captive market for their airliners and engines with some limited inroads into western civil aviation. However the picture today is a bit different. Back then the line between west and east in technical and industrial development wasn’t as dramatically different.
I have been hearing the line about putting Russian engines on Comac jets for about a decade now but three problems I think come up. First the 909 and 919 engines are set. It would take a lot of engineering to integrate Russian engines. Engine integration isn’t like legos you can’t just swap them around. The fuel system, structural components even dimensions of the engine all have to be worked into design.
pulling a NEO build isn’t easy.
For the next problem C919’s engines are not the only western part. To make a sanctions proof 919 you would have to basically redesign the whole aircraft. Global times give the conservative 40% imported parts others are 60% to even 90% by the CSIS.
Even if you use the Chinese numbers (Global Times) many of those are critical systems beyond the power plants. Again these are not LEGO swaps. Everything has to fit inside the mold lines of the aircraft. So even if you have a theoretical replacement you have to now redesign it to fit inside the 919. It’s part of why the Superjet Russification started back in 2018 and is only now officially had a full up maiden flight.
Then comes the economics. The C919 is already facing an uphill battle to get into production and sales. China is still buying Airbus A320 and Boeing 737 Max birds primarily due to the well established global supply and support market. CFM, P&W, RR, GE They have global support networks. Just about anywhere on the planet if your check engine light comes on in the cockpit they can get someone to fix it.
Can the Russians or Chinese say the same? They are both basically starting or restarting from scratch. The PD 14 just entered mass production (at least the Russians claim it to have). Thing is the Chinese also claim the CJ1000A is pretty far along. So if Comac is supposed to reengineer the C919 to be future proof against unreliable foreign policies do they buy the Russian Import and open themselves to unreliable foreign supply and partners like they did with the failed CRIAC scheme or do they just use their own? They might have to put up with Imported Western engines for a while but the existing order book is already built on CFM LEAP.
longer term similar story the C929 with the PD35 hits the wall of known delays on it with the CJ2000 also on the way.