FILE - This July 29, 2017 file photo, Hezbollah fighters stand near a four-wheel vehicle positioned at the site where clashes erupted between Hezbollah and al-Qaida-linked fighters in Wadi al-Kheil on the Lebanon-Syria border. From Lebanon and Syria to Iraq, Yemen, and the Gaza Strip, Iran has significantly expanded its footprint over the past decade, finding and developing powerful allies in conflict-ravaged countries across the Middle East. Iran has used groups like the Lebanese Hezbollah to strike its regional foes, and could mobilize them if the latest tensions with the United States lead to an armed conflict, dramatically expanding the battlefield. (AP Photo/Bilal Hussein, File)
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