The blockade would mostly operate in the Pacific Ocean and Indian Ocean. Interdicting all Chinese sea traffic, and all over-ocean air traffic globally is entire

The blockade would mostly operate in the Pacific Ocean and Indian Ocean. Interdicting all Chinese sea traffic, and all over-ocean air traffic globally is entirely doable. The Chinese military has zero practical operational experience, while the US has an extensive network of global bases and experience up to the eyeballs. There is simply no way China is going to contend with the US globally. Zero trade with the US, Europe, Japan, South Korea and Australia is a given. A sea blockade of trade with Africa, South and Central America, and Australia is fine. That leaves land and air trade only with Asia. How are they going to get oil? China's not going to establish military domination over the Middle East any time soon. As a Brit I don't see us staying neutral, or Australia. Hence the nuclear subs Australia is buying. In a conflict like this, they would use them.