The U.S. will do `` what we must '' to keep the strait open , official says . By Reuters and AFP Mon 27 Jul 2013 05.34 EDT Europe wants tougher sanctions on Iran over its nuclear program .
The U.S. will do `` what we must '' to keep the strait open , official says . Iran says it will do what it sees fit for its defense . Europe wants tougher sanctions on Iran over its nuclear program .