In the event of nuclear war between USA & China what are the most likely first strike targets?

"in a war between the U.S.A and China, Pine Gap will be China’s most important early nuclear target:

“[This is] because of its ability to give the U.S. instant, real-time warning of a Chinese nuclear attack, the precise number of missiles, their trajectory and their likely targets.”

There are other surveillance and communication bases in Australia used by the U.S. that are also most likely to be targeted in a nuclear exchange. These are the surveillance and communication bases at Kojarina near Geraldton and at North West Cape near Exmouth — some also suggest the new U.S. AirForce B-52 nuclear bomber squadron base under-construction in Darwin will join these, as the four prime Australian targets in any war-planning by China. " Declassified Australia PINE GAP READIES FOR U.S. NUCLEAR WAR
With Australians still adjusting to the new AUKUS military agreement, the United States has been quietly expanding and refocusing its satellite surveillance base at Pine Gap, preparing it to fight a nuclear war against China. by Peter Cronau | 19 Aug, 2024 | China, Five Eyes, nuclear

[declassifiedaus.org]

If these Pine Gap surveillance machines can detect missile launches in Ukraine why aren't they located in America or American bases like Guam?