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They can J7 uses,jh7 for training pilot before going to fly J10 ,J16,if China must go to war with terrorists like in Syria, Jh7 combines with J16 is enough to destroying all terrorists.
Russia is unpredictable event they had conflicted with China in the past they made surprise by given Mig 21 blueprint to China . 50-70 J20 per year may not now but may be their goal .J20 may start initial trial production 2019 not full production.F16 F15...
They can move to AL41 or more advance Rusia engine or ws10g , ws15.
US F16 F15 have two kind off engine supply by two engine company too.100j20 may be wrong number if third production line just start this year.CHINA may plan to have 500 J20 so they neED...
cutting 300000 troop can safe about 10 billion dollars equal to 7% of china defence butget 7plus 7 equal to 14 it mean china 2017 defence budget is increase 14%