More than 700 people worked Tuesday to find 20 sailors still missing from weekend storms and to clean up oil which spilled from a tanker that sank in the Black Sea, Russian officials said.
The Russian Rescue Service confirmed three sailors were killed in the storms.
The sailors were from a cargo ship carrying sulfur which sank in the Kerch Strait at the north end of the Black Sea; five members of the ship's crew were among the missing, the rescue service said. 
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CNN's Igor Malakhov contributed to this report.
