The Pentagon is now convinced that air strikes on Syria have become necessary to overthrow the Assad regime, liberate Lebanon and stop support of insurgents waging a guerrilla war against American forces in Iraq as well as Palestinian militants against Israel, the U.S.-sponsored Al Hurra TV network says. "Political action to deal with the problem of Syria's presence in Lebanon and its support of terrorism against Israel and Iraq is no longer deemed effective," Al Hurra quoted American intelligence sources as saying, according to slain ex-Premier Hariri's Al Mustaqbal newspaper on Friday. "Diplomacy as a means to deal with...