The Trump administration Tuesday sanctioned four companies and their oil tankers for conducting business with the Venezuelan government under embattled President Nicolas Maduro. The Treasury Department's Office of Foreign Assets Control named three companies based in the Marshall Islands and one in Greece. The Marshall Islands companies include Afranav Maritime, which operates the Athens Voyager; Adamant Maritime, which operates the Seahero tanker; and Sanibel Shiptrade, which operates the Voyager I ...