Russia's state media say an estimated 3,700 tons of low-grade fuel oil has spilled into the Kerch Strait after two Russian ships were seriously damaged by stormy weather.

Another tanker was also in distress after sustaining damage, Russian officials said. At least one person was killed.

On Sunday, two Russian tankers in the Kerch Strait on the Black Sea caused a disaster, leaking several thousand tons of heavy fuel oil into the water. Greenpeace is sounding the alarm: "Russia's militarization of the Black and Azov Seas has led to another ecological disaster,