Sanctions – economic embargoes, travel bans, freezing of assets – are popular measures used by diplomats to target countries, organizations and individuals violating international law. The effectiveness of sanctions is a matter of debate, but what is clear is that it is the commitment to enforcement that determines success. It’s one thing to ban the import of Cuban cigars; it’s another to prevent small arms from entering a country with porous borders and 3,200km of unguarded coastline.