Activists say the spill - caused after two ships ran were battered by a storm - could cover an area of 400 sq km.

Vast stretches of Russian coast have been tarred by heavy fuel oil from two freighters that foundered in a storm.

Satellite images reviewed by BBC Verify have shown a major oil slick spreading across the Kerch Strait that separates Russia from annexed Crimea, a month after two oil tankers were badly damaged ...

Ukraine has accused Russia of a cover-up over the spill of thousands of barrels of oil from two tankers that split in two ...

Russian officials say rescue workers have successfully removed almost 1,500 tons of oil stranded onboard a tanker that ran ...

Watch some of the special features, stories, interviews and explainers produced by ABC News to bring you a clearer understanding of the issues and events that affect you. ABC iview Home Watch all your ...

Up to 5,000 tonnes of oil has now leaked, and media reports and official statements analysed by BBC Verify suggest the spill has spread across the Black Sea and the Sea of Azov. A senior Russian ...