At this point, the only thing I can think of that might work is a scorched earth policy like Switzerland has but they need to be ready willing and able to carry it out.
All the businesses that can move to another country should start doing so now.
Lots of explosives on critical infrastructure like bridges and tunnels. I just looked it up and it looks like they removed the last of them a few years ago so it's no longer a thing.
Anyways, besides nuclear deterrence, a suicide pact is about the only thing I could think would work as defense against a major global military power.
> Tell me more about Switzerland's scorched earth policy
Self-sabotage, mostly through destruction of critical transport infrastructure as front advances.
The only thing I can come with HK, it is it being played in Lamma channel, if it can be blocked by scuttled ships.
If HK want to go that way, it will not win much things other than time. If PLA will really launch an operation, it only has to turn off water pumps, and wait.
I understand the concept of scorched earth -- I just didn't know that Switzerland had any such plan (perhaps during the Cold War?) ... I wanted to read more about their plan specifically if you have any links.
This was more during WWII, when they were worried about a German invasion to secure more direct access to Italy.
Swiss strategy was generally to be costly to invade, and for its independence not to cause Germany any trouble. The National Redoubt strategy was as much a deterrent as a plan.
All the businesses that can move to another country should start doing so now.