Pakistan in the backdrop of surge in aggression on its western border has decided to install modern air-defence system at Pak-Afghan border. According to a private TV channel on Saturday, Pakistan has chalked out new defence strategy to stop the Nato airstrikes from Afghanistan and aggression of Afghan militants. In this regard modern air-defence system comprising radar, canon with ability to bring down jet fighters would be installed at Pak-Afghan border. Besides, weaponry up-gradation at western border, communication links between the troops at check posts and the command centres would also be improved for joint retaliatory action in case of any aggression across the border.