Although I agree that exercise in Karachi with J-11Bs was with some purpose and PAF may want to see how they can be used in our environment and how effective they would be, but with ability to carry Russian and Chinese weapons they can put IN in trouble if they are available in good numbers and well connected with our assets, they offer much greater range to go after IN ships in deep sea, can carry more weapons, and can launch stand off weapons which will increase reach of Pakistan at sea in air many folds. INs Mig-29 will find difficult to handle them in deep sea as their MKIs will not be there to help them and J-11Bs can launch salvo of air to air multiple seeker missiles which can create similar situation which Indians claim that their MKIs can create against our air force.