Seaborne drone attacks on a Russian naval vessel and product tanker are unlikely to herald a campaign against commercial shipping but may dissuade owners from joining the lucrative trade from the country’s Black Sea oil ports, analysts said on Monday.

The two attacks have not led to an immediate spike in freight rates for tankers shipping oil out of Novorossiysk, where ship movements were briefly halted on Friday following an attack on the warship Olenegorsky Gornyak, shipbroking sources said.