Russian President Vladimir Putin threatened on Tuesday to sever Ukraine's access to the sea in response to drone attacks on tankers of Russia's "shadow fleet" in the Black Sea.
"The most radical solution is to cut Ukraine off from the sea, then piracy will be impossible in principle," Putin said in televised remarks.
He said Russia would intensify strikes on Ukrainian facilities and vessels, and would take measures against tankers of countries that help Ukraine.
On Saturday, a Ukrainian security official said Ukrainian naval drones hit two sanctioned tankers in the Black Sea as they headed to a Russian port to load up with oil destined for foreign markets.
On Tuesday, a Russian-flagged tanker loaded with sunflower oil reported a drone attack off the Turkish coast but its 13 crew members were unharmed, Turkey's maritime authority and the Tribeca shipping agency said. Ukraine said it had nothing to do with that incident.
Missile and drone attacks on the Russian Black Sea port
Ukraine has also carried out missile and drone attacks on the Russian Black Sea port of Novorossiysk that have disrupted oil shipments.
Putin did not elaborate on his threat to cut off Ukraine's maritime access. Russia has captured swathes of southern and eastern Ukraine in the war that began in February 2022, but Ukraine still firmly controls major ports, including Odesa.
Ukraine's foreign minister said on Tuesday that recent comments by Russian President Vladimir Putin show Russia is threatening freedom of navigation in the Black Sea and is not ready to end its war on Ukraine.
"For the second day in a row, Putin makes statements that demonstrate that he does not plan to end the war," Andrii Sybiha wrote on X. "Yesterday, he said he was prepared to fight through the winter. Today, he threatens sea ports and freedom of navigation."