Survivors of a ship fire on Tanzania's vessels, the Candy and the Maestro, in the Kerch Strait arrive at the Kerch sea port, Crimea, Tuesday, Jan. 22, 2019. Ambulance crews on the Crimean Peninsula transported a dozen survivors of a ship fire to hospitals on Tuesday while six of their crewmates have remained missing in the Black Sea. At least 14 sailors died in the tragedy. (AP Photo)

Ambulances wait for survivors of a ship fire on Tanzania vessels, the Candy and the Maestro, in the Kerch Strait to carry them toto hospitals at the Kerch sea port, Crimea, Tuesday, Jan. 22, 2019. Ambulance crews on the Crimean Peninsula transported a dozen survivors of a ship fire to hospitals on Tuesday while six of their crewmates have remained missing in the Black Sea. At least 14 sailors died in the tragedy. (AP Photo)

In this video grab provided by Russia Emergency Situations Ministry press service, a Russia Emergency Situations Ministry ship works to extinguish a fire on the two vessels, the Maestro and the Candiy, near the Kerch Strait linking the Black Sea and the Sea of Azov, Crimea, Tuesday, Jan. 22, 2019. Two Tanzanian-flagged tankers caught fire Monday while liquefied petroleum gas was being pumped from one tanker to another. The blaze spread quickly, prompting the crews to jump overboard. The ships were about 30 kilometers (15 nautical miles) off the Crimean coast when the fire started. (Russia Emergency Situations Ministry press service via AP)

In this video grab provided by Russia Emergency Situations Ministry press service, a Russia Emergency Situations Ministry ship works to extinguish a fire on the two vessels, the Maestro and the Candiy, near the Kerch Strait linking the Black Sea and the Sea of Azov, Crimea, Tuesday, Jan. 22, 2019. Two Tanzanian-flagged tankers caught fire Monday while liquefied petroleum gas was being pumped from one tanker to another. The blaze spread quickly, prompting the crews to jump overboard. The ships were about 30 kilometers (15 nautical miles) off the Crimean coast when the fire started. (Russia Emergency Situations Ministry press service via AP)

In this video grab provided by the Kerch.fm web portal, the two vessels, the Maestro and the Candiy, on fire near the Kerch Strait linking the Black Sea and the Sea of Azov, in Kerch, Crimea, Monday, Jan. 21, 2019. Two Tanzanian-flagged commercial vessels caught fire in the Black Sea, leaving at least 10 sailors dead, Russian officials said, and seven sailors are reported still missing. (Kerch.fm via AP)

(190121) -- KERCH STRAIT, Jan. 21, 2019 -- Photo taken on Jan. 21, 2019 shows a burning ship in the Kerch Strait. Two ships caught fire after a possible explosion while moving through the Kerch Strait, killing one sailor on board, Russia s Federal Agency of Maritime and River Transport (Rosmorrechflot) said Monday. ) KERCH STRAIT-SHIPS-FIRE Sputnik PUBLICATIONxNOTxINxCHN

(190121) -- KERCH STRAIT, Jan. 21, 2019 -- Photo taken on Jan. 21, 2019 shows a burning ship in the Kerch Strait. Two ships caught fire after a possible explosion while moving through the Kerch Strait, killing one sailor on board, Russia s Federal Agency of Maritime and River Transport (Rosmorrechflot) said Monday. ) KERCH STRAIT-SHIPS-FIRE Sputnik PUBLICATIONxNOTxINxCHN