" U.S. forces invaded Iraq in 2003 because President Bush determined that if sanctions could not force regime change, the military must. In this case, shrugging off Saddam’s bravado and keeping him isolated was the better choice. In 2013, when Syria’s Bashar al-Assad appeared ready to use chemical weapons on his own people, President Obama drew a red line. Assad’s use of these weapons, Obama warned, was a “game-changer.” Assad is then believed to have used those chemical weapons, but Washington took no action against his government, instead allowing Russia to broker a hasty deal to destroy the weapons. Obama chose flexibility; he was wise to do nothing. "

― Ian Bremmer , Superpower: Three Choices for America's Role in the World