

The Chinese government is not big on drugs in general, yes. Part of that is that, like most elsewhere, the higher ranks of the CPC tend to be older and more socially conservative, but also China has some very understandable generational trauma about drugs from the Opium Wars and ensuing century of humiliation.
What’s left to even sanction Russia with at this point? You can’t threaten someone with something you already did 4 years ago.