Aamir Barkawi is the main antagonist to secondary terrorist of London Has Fallen, the 2016 sequel to Olympus Has Fallen. He is an arms dealer and terrorist who is located in his hideout in Yemen, where he plans a massive attack on London with his son Kamran leading the attack to kill the world's major leaders. He wanted revenge against America for the drone attack that killed his family while it was targeting Barkawi.
Despite being the main villain, most of the focus as the main antagonist is given to his son Kamran, as Aamir never sets foot in London and he stays at his headquarters in Yemen. Mostly he is the secondary villain in the movie.
He was similar to Ernst Stavro Blofeld in James Bond movies, where he and James Bond don't interact and pursue each other. Just like in London has fallen, where he doesn't interact with Mike Banning or fight against him. That is why his son is the main antagonist Kamran in the movie.