They have imposed very heavy sanctions on the Russian aviation sector, trying to ground the entire commercial/passenger fleet, but at the moment they have not succeeded, indeed precisely the importance of air connections in a country with enormous territorial dimensions such as the Federation Russian, has given impetus and large investments to the national industry of each sector of aircraft construction (which was previously reduced, but not disappeared), it will certainly take a few years, but then they will be completely self-sufficient in the production of /passenger aircraft.
Most of countries in the world do not allow Russian airlines to enter their territorial air at the moment,including China. Because the airbus and boeing air planes of Russian fleet can no longer get any regular maintaince or replacement parts,so it is deemed unsafe to fly by other countries.
As for Russia’s own plane MS-21,they can only fly to those countries who granted airworthiness certificate to it,at the moment I don't know any country did that(maybe Iran).
So that means for international travels,Russia can only rely on foreign airline. The same thing could happen to China