U.S. politicians love the “silver bullet” of economic sanctions to punish foreign adversaries, but the weapon’s overuse is driving China and Russia to develop countermeasures, as British diplomat Alastair Crooke explains.

Iran’s Supreme Leader Ali Khamenei told a large group of people in the holy city of Mashhad on Sunday that “The Americans did not act on what they promised in the [Iranian] nuclear accord [the JCPOA]; they did not do what they should have done.