Elias and Michael Gotsis-backed Eurotankers is locked in an arbitration battle with a Nigerian government-controlled asset manager over a collapsed deal.

The dispute has kept a suezmax tanker under arrest in Rotterdam for more than a year as the sides disagree over whether there was an agreement to sell the ship.

The battle emerged from a March 2016 effort by Eurofinance Services, an affiliate of Greece's Eurotankers, to buy the 146,000-dwt Mongolia (built 1996) from Asset Management Corporation of Nigeria (Amcon), a government company that deals in distressed assets.