Iran has increased arms shipments to both Iraq's Shiite extremists and Afghanistan's Taliban in recent weeks in an apparent attempt to pressure American and other Western troops operating in its two strategic neighbors, according to senior U.S. and European officials. In Iraq, Iranian 240mm rockets, which have a range of up to 30 miles and could significantly change the battlefield, have been used recently by Shiite extremists against U.S. and British targets in Basra and Baghdad, the officials said. Three of the rockets have targeted U.S. facilities in Baghdad's Green Zone, and one came very close to hitting the U.S....