Overall, 35 vessels have been prevented from carrying out normal operations and only vessels moving toward Russian ports on the Azov Sea are permitted entry, he said on Facebook, according to Reuters.
“The goal is simple - by placing a blockade on Ukrainian ports on the Azov Sea, Russia hopes to drive Ukraine out of our own territory - territory that is ours in accordance with all relevant international laws,” he said.
Omelyan said 18 vessels were awaiting entry into the Azov Sea, including four to Berdyansk and 14 to Mariupol. There is also a line of nine vessels to leave the Azov Sea and eight other vessels are standing by near the port berths.
Grain and steel dominates the Azov ports shipments.
Russia seized three Ukrainian navy ships and their crews on Sunday near the Crimean peninsula, which Moscow annexed in 2014, over illegal entry into Russian waters - a charge Ukraine strongly refutes.
Moscow has clarified that Russia reserves the right to defend the waters east of Crimea as an integral part of its territory. The Black Sea peninsula in southern Europe rejoined Russia in 2014.
The reunion of Crimea has been a sticking point in the relations between the two countries.
Both Moscow and Kiev accuse each other of harassing each other's shipping in the area.