Seeking to deter further shipments of Iranian fuel to Venezuela, the Trump administration has quietly warned foreign governments, seaports, shipping companies and insurers that they could face stiff U.S. sanctions if they aid the tanker flotilla, the U.S. envoy on Venezuela told Reuters on Friday. Elliott Abrams, Washington’s special representative on Venezuela, said the pressure campaign targeting heavily sanctioned U.S. foes Iran and Venezuela was being waged “to be sure everyone recognizes this would be a very dangerous transaction to assist.”