Most parts are able to be manufactured anywhere. Certainly, it is cheaper (generally) to buy the parts from the usual manufacturers. But supply and demand will cause those parts to start to be made, whether in Russia itself, or in China (more likely). If those parts start to get made more cheaply in China than the original 'western' parts, the western parts will eventually become uneconomic to make and be pushed out of the market.

Sanctions are generally a two-edged sword. There is pain caused to the sanctioned party in the short-term, but the sanctioning party more often finds itself damaged in the long-term by being shut out of its traditional markets when the sanctioned party starts buying things elsewhere.