Shipping traffic in Turkey's Bosphorus Strait partially resumed on Thursday morning after a brief suspension caused by the engine failure of a ship.
Traffic had partially resumed in a northbound direction, the Tribeca shipping agency said.
It comes after traffic in the Bosphorus Strait was suspended in both directions on Monday because of a salvage operation for another floundering ship, the agency said.
In September, shipping was halted in the strait after a vessel carrying 3,000 tonnes of corn from Ukraine ran aground.
Millions of barrels of oil pass through the 19km-wide strait each day. About 700 million barrels of crude have flowed through the vital passageway in the past year.
A key transport route connecting the Black Sea to the Mediterranean, the Bosphorus is also vital to the UN-brokered grain deal, which assuaged fears of a global food shortage after its adoption in July.
Ukraine is a major global grain producer and exporter, but production and exports have fallen since Russia invaded the country last February and started blockading its seaports.
