Sanctions would be a major consequence, it would pretty much end the role of China as the manufacturer for the West. Would have a massive impact on all of us, will take years to move production elsewhere.Chinese defence analyst was saying on the radio he believes that if Xi remains in power he will attack Taiwan its a matter of when not if, the only reason he's not doing it now is because his military isn't where he wants it to be and any potential failures would weaken his position considerably, but when he's ready he will attack. The question is what will the US do about it? Looking at Ukraine I'd imagine beyond supplying any rebels and the regular army if the war persists, not much.