The ship is alleged to be part of a shadow fleet dodging western sanctions. It had no oil onboard – but was it carrying Russian weapons?

A massive, rusty crude oil tanker floating north through the Atlantic has become the centre of global interest after it was followed for days and eventually seized by US forces while Russia’s military rushed towards it.

Despite not carrying any oil, the 300-metre-long ship is clearly of value. Theories for why range from speculation that high-value Russian weapons are hidden in the hull, to the ship’s potential to become a symbolic trophy in a transatlantic power struggle between Washington and Moscow.