This was reported on Twitter Bosphorus Naval News.

#USSDonaldCook passed through Istanbul on 19th January 2019 northbound. This is the deployment of a destroyer and the deployment of a US Navy ship to the Black Sea. To track movements of foreign warships through Bosphorus click here: https://t.co/MYUQ7ILfpJpic.twitter.com/TEVqQLBlco

- Bosphorus Naval News (@ Saturn5_) January 19, 2019

Earlier it was reported that Donald Cook is heading to the Black Sea.

The press service of the 6th Fleet of the United States said that the destroyer should be in the region including "to conduct operations to ensure safety at sea."

Subsequently, the Russian Ministry of Defense reported that the forces of the Black Sea Fleet began tracking the American ship.

The events involved the patrol ship "Inquisitive."

Read more about the current situation in the RT material.