Recent US sanctions have targeted some vessels managed by the Greek firms responsible for over half of the Venezuelan crude exports last month, according to industry databases, as Washington tightens the screws on President Nicolas Maduro.

On Tuesday, the Office of Foreign Assets Control (Ofac) sanctioned Dynacom Tankers Management’s 50,000-dwt Chios I (built 2017), Thenamaris’ 306,500-dwt Seahero (built 2006) and NGM Energy’s 300,000-dwt Voyager I (built 2003) for allegedly loading oil from Venezuela between late February and the end of April.