Alaska was taken back by America before the great war. America was invading China itself when the nukes were launched.
I doubt China would have such a project. FEV was top secret. If they had known about it they would have nuked Mariposa. China would have put their time into countering PA which allowed America to break the back of China's armies.
I think we have to give the chinese a little more credit though.
They didn't just sit around and wait for America to develop things and then invent a counter to it..
As far as I'm aware China was a super-power in its own right in pre-war FO?
There is hardly
any information about them though.
People are already geting tired of some of the factions and creatures in the current FO world.
I think A secret base in Alaska that when entered accidently releases a hoarde of mutant creatures that was once intended to ravage pre-war north America could be a cool way to introduce some new enemies.
It would also be a cool way to give us a little 'lore' about the other main antagonist in the great war.
Anyway, was just an idea.