The death of a top Iranian military commander in Syria this week has dealt a "psychological blow" to elements backing Syrian President Bashar al-Assad, according to a U.S. intelligence official. The killing of a commander in the Revolutionary Guards Corps at the hands of ISIS also highlights the extent of Iranian involvement in Syria and the dire straits in which Assad finds himself, Washington-based analysts say. Brig. Gen. Hossein Hamedani was killed outside Aleppo, Syria, where he was advising the Syrian army in its fight against extremists, Iranian state media reported Friday. Iranian media carried messages of condolence from Iranian...