I think they do buy the tools, and at least for sure they widely buy the resulting products from them.They are making a huge mistake then because Chinese tools are often much more "open source" than western ones and compete on performance and cost rather than regulatory moats, while their own industry is quite artisinal at this point and do not benefit from economies of scale.
The question is more if China can make enough to fulfil Russia's demand, when most indicators show that China is struggling to keep up with its own home demand first.