Now we're taking about three expensive assets in sufficient numbers and along with the required supply chain and maintenance facilities:

- state-of-the-art submarines. Anything else can't hope to evade the Chinese, and they probably have to be nuclear as well to ensure range and stealth

- submarine-launchable missiles (ballistic or cruise), with a lot of range since China can probably deny the sea immediately off the mainland.

- nukes compact and reliable enough for the missiles