Four companies (three Liberian and one Italian), as well as nine tankers were added to the sanctions lists.
Tankers go under the flags of Malta, Italy, Greece and Panama.
On April 5, the US Treasury imposed sanctions against 34 vessels of the Venezuelan company PDVSA, as well as two companies that supplied oil from Venezuela to Cuba.
Cuban leader Miguel Diaz-Canel Bermudez called them "imperial arrogance."