What would happen in Bitcoin in the same situation when you have Chinese miners cut off from the rest of the world and mining their own fork with their PH/s for 3 days?
Since the Chinese miners would still have less hashing power than the rest of the world, their chain will get "orphaned". When their nodes rejoin the network,
they should automatically choose the fork with more "work" in it. Many transactions would have to be rebroadcast, and such nodes will likely enter
"safe mode" if that happened.
Edit:
Somewhat relevant