Sig (Russian: Сиг) is a Russian product tanker, designed to transport refined oil products,[1] it is 141 m (462 ft 7 in) long, measured at 4,754 gross tonnage (GT).

The Sig, and its owner, Transpetrochart, were placed under the United States Office of Foreign Assets Control sanctions in 2019 for supplying jet fuel to Russian forces in Syria[2] and is sanctioned by the US Department of Treasury under Ukraine/Russia-Related Sanctions Regulations UKRAINE-EO13685 which relates to blocking property of certain persons and prohibiting certain transactions with respect to the Crimea Region of Ukraine.

[3] On 5 August 2023 the tanker was reported to have been the target of a naval drone attack by Ukrainian forces in the Black Sea 17 kilometres (11 mi) south of the Crimean Bridge which damaged the engine room on the starboard side.

[5] The Russian media company TASS reported that the vessel was afloat and was being assisted by two tugboats.

[6] A video of the ship in dry dock shows the hole below the waterline to be much larger than the initial assessment.