UK insurer Steamship Mutual has issued a warning to members over trading with Venezuela.
The move comes after an apparent widening of US sanctions against the South American country to include shipping oil to Cuba - and potentially elsewhere.
Greek operator Proper In and its 72,000-dwt tanker Despina Andrianna (built 2000) were blacklisted last week over alleged shipments from Venezuela to Cuba, which is seen as being supportive of president Nicolas Maduro's regime.
