April 16 (UPI) -- The United States blacklisted three people, 17 entities and nine oil tankers accused of aiding Iran in evading sanctions, as the Trump administration targeted Tehran's main revenue source amid ongoing negotiations to end the war. The sanctions announced Wednesday target an oil shipping network allegedly operated by Iranian shipping magnate Mohammad Hossein Shamkhani, the 41-year-old son of the late Ali Shamkhani, a senior Iranian official. "Under President Trump's leadership,