its not empty bravado but a realistic counter threat to suggest pakistan has more tools to play with then many other nations when it comes to defence
the united states policy of warning the isi has been going on for a long time and their still being patient?? the truth is they dont want to come face to face with pakistan, atleast not yet.
its only pakistans defensive strength which has forced potential aggressors to rethink their policy and keep warning. they cant even up the tempo too much
working against cia normally carries grave punishment, not warnings