I don't think Pakistan Military needs permission from the politicians to engage any bogie, This is not how command of chain works in Pakistan military. PAF has been authorized and they will engage any bogie. You don't call the PM we have an Air space violation. if Air space is in denial PAF has authority to take down the violator. If it was a MQ-9 it was visible on RADAR and they would have intercepted. If it was senital then it is hard to track but I don't think sentinal carry weapons. Still I don't believe in the news as the orders were clear and PAF would have engaged unless the drone was well out of range before the interception but then again with in 10 km of border is consider a hostile act and jet would have been in range by then.