Yes, nobody wants tariffs, but China is already facing them from USA, so they are more at risk.bthe EU won’t want retaliation from China but they also don’t want Russia to continue to affect their economy and stability. China would have to choose and they would choose Europe as they are not natural allies with Russia anyway, and Russia won’t buy much off them. China needs huge amounts of resources, some of which Russia has, but they are moving away from fossil fuels faster than europe and USA and Russia.
Yes, when China first started supporting Russia, much commentary noted that and made the point that Russia was desperate for allies and products and China anted to increase influence, so could use the increased relationship to their advantage to exert control over Russia, through the use of financial tools.