What if, instead of only attacking United States, the Terrorists gone even crazier and decide that the other permanent members of UNSC also deserve the "punishments" too...?
So let's say the Terrorists successfully hijacked some airplanes and made them crashed to London, Paris, Moscow, and Beijing, in addition to New York City. Thousands are dead in those five cities, and some important buildings (Eiffel Tower, Kremlin, etc) are severely damaged.. What happen next? Would we see some Russian and Chinese military presence in Middle East?