How does this work for long range flights (over 12 hours non-stop) where there is one Captain rated pilot and three type rated F/Os?

I know that the Captain is still PIC even in the bunk, and none of the F/Os have had the Captain IOE, but I believe that, according to US rules whichever type rated F/O is pilot flying while the Captain is in the bunk is allowed to log PIC for that time.

I am trying to reconcile that with China rules.

Joe