"We will not, however, comment on the nature of our diplomatic correspondence with the Government of Turkey", reported the cable network, quoting a State Department spokesman.
NATO, which includes several Black Sea member states, and the United States have routinely sent warships patrolling the Black Sea, despite Russian concerns.
"We reserve the right to operate freely in accordance with global laws and norms", he said.
Shipping traffic has resumed to and from Ukraine's ports on the Sea of Azov following a standoff with Russian Federation, a Ukrainian minister said Tuesday.
"Ukraine, the United States and the global community has taken proactive and decisive action in 2014 aimed at combating the illicit aggressive behavior of Russian Federation, including the imposition of economic sanctions". The drill came as Kiev has accused Moscow of planning to seize two of its strategic port cities.
Russian Federation seized Ukrainian ships and sailors last week and has been accused by Kiev of restricting the movement of vessels through the narrow Kerch Strait, which connects the Sea of Azov to the larger Black Sea.
6 dead, dozens hurt in club stampede in Italy
Some survivors were quoted by Italian media as saying at least one fire exit was blocked when concertgoers tried to get out. The Lanterna Azzurra club was hosting a concert by rapper Sfera Ebbasta and up to 1,000 people were thought to be inside.
The proposed spin suggests that fragmentation injuries suffered by the three Ukrainian navymen were allegedly a result of a "hand grenade explosion" on board during the skirmish between the crew and the SBU operative rather than a result of an armed attack on the boat by Russia's Izumrud coast guard ship. Ukraine has declared martial law in some regions and banned entry to Russian men aged 16 to 60.
Relations between the two countries have been strained since the crisis began in eastern Ukraine in 20-14 and Crimea re-joined Russian Federation following a referendum the same year.
Russian Federation is still stopping vessels to inspect them, he said Tuesday in a statement on the ministry's website.
According to CNN, the last USA ship to enter the Black Sea was the fast transport ship USNS Carson City in October.
Under the rules of the Montreux Convention, US ships can only be in the Black Sea for 21 days.