The Russian Black Sea fleet is now unable to operate in the area around drilling platforms near Crimea that the Ukrainians seized earlier this week, according to the Ukrainian Navy.
The platforms are known as the Boyko Towers.
“There is still a threat from the air in the area where these towers are located, as Russian aviation continues their presence there," said Dmytro Pletenchuk, a spokesperson for the Ukrainian Navy.
However, Pletenchuk said that Ukrainian coastal artillery as well as man-portable air defense systems (MANPADS) and missile systems meant that the Russian fleet “cannot approach these towers.”
Some background: Ukraine said Monday that it had regained control of the Boyko Towers. They have been controlled by the Russians since soon after the annexation of Crimea in 2014.
Defence Intelligence of Ukraine said the towers had been used by the Russians as helicopter landing sites and for the deployment of radar equipment.