And in response the US will have its proxies Britain, France, etc step up a naval blockade of Russian oil and cargo hoping to break Russia’s will and economy and force them to accept unfavorable terms.

Strongly agree with most of what you’re saying.

A country must have enough nukes to ensure decently proportional retaliation. If the USA can kill 1 million Chinese, China should be able to immediately do the same ad infinitum. Otherwise, the calculus breaks down in one side’s favor. Let’s assume a nuclear exchange between China and the USA based on Wikipedia’s stockpile numbers for each.

The calculus for China is even more complex. They need the ability not just to take x lives for x lives. They need the ability to suppress US and NATO capabilities globally. It’s not enough to suppress the US mainland when the US stations nukes and has military forces, bases, reserves, pawns all over western Europe, as well as smaller bases in the middle east in places like Jordan, as well as places in Asia itself like Japan, occupied Korea, etc, etc. Nukes could come from anywhere including a pawn which the US disavows.

China needs a nuclear capability that is enough they can wipe out the US in a tit for tat mainland attack but also have enough that if they start with attacking US assets outside the US, they’ll have enough after finishing that to still finish the US and the UK. I’d say 1500 bare minimum. Luckily they are on their way to 1000 though it will take time, time in which they’re under greater threat.

They must also consider interceptor tech or the math that not all warheads will reach their destination if this is in response to a first strike by the US who is now waiting fully prepared to mitigate as much as possible (to say nothing of the possibility of the US actually managing to take out a chunk of their warhead stock in the first strike). So you need to allocate at least 10-20% more warheads than you think you need, maybe as high as 30%. Having reserves never hurts. Of course this is alleviated somewhat by putting such warheads on hypersonic missiles/delivery systems but I don’t think the Chinese have entirely switched their nuclear arsenal over to those yet as they are still kind of a beta product and may not be considered ready for that duty. But even those there’s still the chance the US could launch counter-nukes into the atmosphere in the path of incoming weapons to destroy them and a hypersonic missile if caught close enough would be destroyed just the same as a regular one (though I admit given the plasma around them they probably have an advantage in being able to be closer to such a blast and continue than normal missiles).

And I’ve mentioned this before they need enough to hit all these places plus New Zealand. Why NZ? Because it’s where all the big western bourgeoisie have their bunkers and will likely flee and they need to know they’ll die because China will drop 3 nukes one on top of the other on them and bury them alive in their now tombs.