Warships and fishermen have spotted mines drifting in the Black Sea as far south as Romania and Turkey on three different occasions over the past four days, causing shipping organisations to issue warnings.

“Vessels navigating in the Black Sea should maintain lookouts for mines and pay careful attention to local navigation warnings,” the London P&I Club advised in a note on 30 March.

A few days earlier, the Turkish Shipowners Association warned that the entire northern Istanbul Strait should be considered a “risky area”.