Yep. If things go truly down, a possibility could be a mass attack from Russia on Ukraine to get some land there (or for other strategic purposes dunno) and China might escalate on the SCS.
Honestly, I cant really say that this scenario will happen but if it did, then to me that would mean that Russia would repay China's favour by stirring up trouble on Japan or Eastern Europe, if China decided to take over Taiwan
There really isn’t much for China to gain to create conflict in the SCS, nor would it serve much purpose as a strategic distraction.
The only rationale for China to stir things up in the SCS is if they want to retake Taiwan but have concluded that the US will directly intervene militarily.
In which case it would make sense to start a war in the SCS first and destroy, or at least severely degrade the USN in the naval meat grinder China built there so that America would not no viable military option left when China does move on Taiwan.
But that is both premature and dangerous at this stage. American involvement is not guaranteed on Taiwan, and there are far more effective ways for China to start a war with America than to stir things up in the SCS with more island building. Announcing an ADIZ over the SCS and aggressively intercepting US military aircraft in it would do it.
Personally I see it as China having given the Russians a heads up that they might move on Taiwan in the not too distant future, and Moscow is taking advantage to line up on Ukraine such that once China goes on Taiwan, they will move on Ukraine while the world’s attention is on Taiwan. This will also present the US with an impossible choice of deciding if it wants to surge forces to Europe or Asia, or do both and potentially be massively trounced in either or both theatres due to spreading their forces too thinly.