MOSCOW, March 4 (Bernama-Sputnik/RIA Novosti) -- Mojtaba Khamenei, the son of Iranian Supreme Leader Ali Khamenei, who was killed in the United States (US) and Israeli airstrikes last week, is the leading candidate to be the next supreme leader, Sputnik/RIA Novosti reported, citing a report by The New York Times newspaper that cited Iranian officials.