Protect them from what? From two prototypes using 80s-vintage Russian engines because the Chinese haven't got round to producing an appropriate power plant?
Earlier we spoke of how reflexive paranoia lead the Soviet Union to bankrupt themselves preparing for a hypothetical war. Would you have us do the same?
Have you ever asked yourself why the Chinese chose to release pictures of the J-20 when hey did? I think this guy has it about right on that score:
http://www.atimes.com/atimes/China/MA14Ad02.html
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