In a high-stakes game involving three tankers seized in two countries with more than 400,000 tonnes of crude oil on board, efforts to offload an Iranian cargo impounded in Greece are progressing at a snail’s pace.

According to sources with direct knowledge of the matter, 68,000 tonnes of oil have been offloaded so far from the 115,400-dwt aframax Lana (built 2013) — a Russian-linked, Iran-flag vessel detained by Greek authorities since April.