All nations want import substitution even at peace. It's monstrously difficult because the country that produces the best/cheapest goods does whatever it can to keep its market-share.

Another thing not pointed out enough is Russia's declining foreign reserves. Letters of Credit/Trade Finance allow businesses to put trade first instead of their cash flow. As Russia's reserves dwindle Chinese companies become less eager to provide Russian companies with financing. That's why I believe you're seeing a falloff in that. Not fear of Western sanctions, just old-as-history "scared we won't get paid." :)