The US and Iran are coming ever closer to a nuclear deal, but critics of the renewed agreement suggest it might not be the boost for tankers owners expect.

Both US and UK officials said the two sides are close, though final details need to be ironed out according to several media reports.

“There has been significant progress and we are close to a possible deal, but a number of difficult issues still remain unsolved,” US state department deputy spokesperson Jalina Porter said on Wednesday.