"There is a possibility that Japan and China will go to war in the Taiwan Strait."

I agree. At this point I am sure China will act to secure access to oil, but I am not smart enough to predict how. I have speculated that China will take Taiwan, because the US cannot fight three wars at the same time, but I realized China isn't stupid enough to take Taiwan and lose it, much as Russia is losing the Ukraine by conquering it. Ukrainians' opinions of Russia are continually becoming worse the longer the conflict draws out. There are more reasons for China not to take Taiwan than there are to take it. More importantly, actively waging war on the US will not improve China's access to petroleum, and if it is going to war for petroleum, Iran is the place to do it, IMHO.

But China has been dangerously cut off from supplies it is extremely intent on by this war in Iran. Immediately prior to the US attacking Iran, it also attacked Venezuela, which supplied China quantities of oil. The US even seized a tanker full of oil China had already paid for. I'm not a geologist, but Nigeria, Darfur, Russia, Azerbaijan, and Malaysia seem to be what supplies are left for China, as Norway, Canada, the US, and Venezuela, as well as all production in the Persian Gulf, are essentially able to be denied to China by the US.

I am less concerned China will go to war with Japan than it will take an active part in defending Iran.

Thanks!