With the end of the grain deal, the situation on the Black Sea has worsened.
Russia has been bombing Ukrainian ports on the Black Sea in order to stop grain shipments, which are vital to the Ukrainian economy. They have even attacked sites on the Danube, just a few hundred metres from Romania. The Russian navy has set up a blockade and considers any ship attempting to cross it a threat.
In retaliation, Ukraine has declared six Russian ports to be war risk zones. On 4 August, the Russian navy ship Olenegorsky Gornyakin was attacked by drone in the port of Novorossiysk. The following day, the oil tanker Sig, carrying fuel for Russian troops in the Black Sea near Crimea, was hit. Ukraine uses drones to target ports and ships.
Unlike Russia, it targets specific ships. These are ships flying the Russian flag and are sanctioned by the United States.