Sovcomflot tankers go dark in Black Sea, citing maritime security fears
Crude oil worth more than $410m tracked through Bosporus Strait on five suezmax tankers, part of a fleet of 11 owned by Sovcomflot that were tracked switching off their AIS since September to load at unknown ports
Russia-controlled shipowner says August attacks on commercial ships in the Black Sea behind the move, which is compliant with international Solas conventions
