Two tankers were hit by storm in Kerch strait on 15 December, causing one to sink and another to run aground
Russia has warned of severe environmental damage from a huge oil spill in the Black Sea caused when two tankers were hit by a storm near Crimea, which has declared a state of emergency.
One tanker sank and another ran aground on 15 December in the Kerch strait between Russia and the illegally annexed Crimean peninsula.
