Overall exports from Kozmino will jump in May to an all-time high of 2.94 million tonnes, Reuters data showed.

The move comes after Russian oil exports to Europe have been curtailed for more than two weeks due to quality issues.

Kozmino's ESPO crude oil blend is traded more than a month upfront which means May cargoes had been already sold to buyers more than a month ago.

The way the crude is sold makes late additions to the loading programmes from Kozmino very rare, traders said.