Damage caused to two Russian tankers in stormy weathers in the Black Sea caused an oil products spill, the Interfax news agency cited Russia's Federal Agency for Sea and Inland Water Transport (Rosmorrechflot) as saying on Sunday.
The two cargo ships were damaged due to bad weather in the Kerch Strait between mainland Russia and annexed Crimea and have requested assistance, Russia's emergency services ministry said on Sunday.
There were 13 people on board the Volgoneft 212 tanker, and 14 people on the second ship, the Volgoneft 239, the ministry said.
The ministry said more than 50 people and equipment including an Mi-8 helicopter and a rescue tugboat had been deployed.
Russia's Kommersant newspaper reported that the Volgoneft 212 tanker was carrying about 4,300 tons of fuel oil.
Unverified video posted on Telegram showed some blackened water on stormy seas and a half-submerged tanker.