Group 1 - Besiktas Shipping has suspended all shipping operations with Russia following an explosion attack on its tanker "Mersin" [2] - The "Mersin" tanker, flagged under Panama, was attacked near Dakar, Senegal, on November 27, resulting in severe damage and flooding [2] - Besiktas Shipping is one of Turkey's largest tanker operators, owning 29 tankers, and has emphasized compliance with international sanctions [2] Group 2 - Prior to the attack on "Mersin," two Russian "shadow fleet" tankers were targeted by drone strikes in the Black Sea region [2] - Ukraine confirmed the use of its domestically produced "Sea Baby" maritime drones to strike the "Kairos" and "Virat" tankers between November 28 and 29 [2] - On December 2, another Russian tanker, "Midvolga 2," was attacked approximately 80 nautical miles off the Turkish coast while transporting sunflower oil to Georgia [2] Group 3 - Following these incidents, shipping insurance costs in the Black Sea region have significantly increased, with insurers reassessing war risk [2] - The Black Sea coastal countries include Ukraine, Russia, Georgia, Turkey, Bulgaria, and Romania, with key ports such as Odessa, Novorossiysk, Batumi, Istanbul, Varna, and Constanța [2]