Pentagon officials have announced the USS Vella Gulf, a US warship, will reach the Black Sea later this week as part of maneuvers showing support for Ukraine.
Navy Rear Admiral John Kirby was quoted by the Huffington Post as saying that the US also aimed to reassure its European allies that Washington is committed to their security, as tensions between Kiev and Moscow remain.
The French anti-submarine frigate Dupleix is to join on Monday the country's vessels in the Black Sea.
Its mission is scheduled to continue from April 14 to May 1, according to the website Infosdefense.com, cited by UNIAN news agency.
The US navy extended the mission of the USS Truxtun in the Black Sea, reports Bulgaria's public broadcaster BNT.
The reason are the tensions in Ukraine and the annexation of Crimea by Russia.
The guided-misslie destroyer, which is based in Greece, sailed in the Black Sea in March to participate in a joint military exercise of the navies of Bulgaria, Romania and the US.
Joint naval exercises with Bulgarian, Romanian and US vessels are to take place in the Black Sea on March 11.
The naval forces of all three nations have stated no connection between the upcoming drill and the tensions on Ukraine's Crimean Peninsula, where the Russian Black Sea Fleet is based, the Bulgarian National Radio has reported.