China cannot simply invade Taiwan in a moment whenever opportunity strikes, it would need significant and obvious preparation and buildup, because they would be contemplating a naval invasion on an almost unprecedented scale.

Russia probably will mobilize however far it’s government feels it safely can regardless of China; NATO isn’t going to directly invade Russia itself because of it’s nuclear arsenal, and isn’t terribly likely to actually send a serious number of troops to Ukraine for the same reason, so what it primarily has to worry about is western sanctions and military equipment, and of course the efforts of the Ukrainians themselves, which it already has to deal with regardless of what China is doing.

Israel for it’s part is also a nuclear armed state, so actual full scale war being declared upon it by it’s neighbors is unlikely. Support for terrorist or resistance groups, sure, maybe some sanctions, and definitely a lot strongly worded condemnation, but I’d very much doubt that the leadership of those countries cares enough about the Palestinians to declare a possibility suicidal war over it, the kind of politicians that lead these countries aren’t exactly famous for their empathy.