Laborious !The A-400M looks like a dubious buy.
If China could not buy heavy transports, making its own is more important than anything else.I looked at some numbers:
The maximum payload as a percentage of maximum take off weight is about 30% for Y-20, C-17 and An-70, less than that for the older Il-76 and the new A-400M and Kawasaki C-2, while the range with that load is more than 4000 km for all but the A-400M.
Y-20 needs the next engines to achieve that of course. The A-400M looks like a dubious buy.