Unfortunately Chinese companies are not 100% reliable either. A lot are scared of Western sanctions. Like Huawei, DJI, or Alibaba even.Chinese companies still have a choice and are still competing commercially, while Mikron is heavily focused on Russian MIC. It would be very foolish for them to rely on US or European tools, seeing that they're in direct conflict with them in Ukraine.
Huawei left the Russian mobile phone provider space in Russia. Basically 30% of base stations in Russia use Huawei equipment. And now they have zero support or upgrades.
The Russians will just smuggle whatever they need, if they cannot buy it outright, it is as simple as that. If the Chinese industry does have alternatives, they just need to prove it, and make a case for a sale really.
I suspect the Russian semi industry is already cooperating with the Chinese one to a degree, but of course this is not being done out in the open.