The Arleigh Burke-class guided-missile destroyer USS Ross has entered the Black Sea.

At the same time, the Ministry of Defense of the Russian Federation says the Russian ships "are continuously monitoring" the vessel.

"The designated forces and assets of the Black Sea Fleet are continuously monitoring the USS Ross guided-missile destroyer, which entered the Black Sea on April 14," the ministry's press service told UNIAN.

The U.S. ship was taken under constant surveillance by the coastal e-warfare equipment of the fleet when entering the Black Sea.

In addition, the U.S. destroyer is being monitored by the Vasily Bykov patrol ship and the Ivan Khurs reconnaissance ship of the Black Sea Fleet.

As UNIAN reported earlier, NATO Foreign Ministers agreed a package of measures to improve NATO's situational awareness in the Black Sea region and strengthen support for partners Georgia and Ukraine.

Ukrainian Foreign Minister Pavlo Klimkin said the package of measures contained a number of classified provisions.