U.S. President George W. Bush (R) and Russian President Vladamir Putin hold a joint press conference outside the main house at Walker's Point in Kennebunkport, Maine July 2, 2007. The two leaders exchanged ideas on Iran nuclear issue, anti-missile defense system for Europe, etc. The United States announced that Iran is still a threat to the world even though evidence showed that Iran had stopped its nuclear weapons research since 2003.