Russian S-400 anti-aircraft missile systems have been spotted near the city of Kerch in eastern Crimea.

Ukrainian Foreign Minister Pavlo Klimkin has appealed for NATO support in the confrontation with Russia over the Black Sea and the adjacent Sea of Azov, a key commercial waterway for the country.

Security checks were under way at roads leading into Mariupol on Wednesday, as the country continued to adapt to the imposition of martial law.

Residents of the city of Berdyansk were gearing up for the imposition of martial law on Tuesday after the Ukrainian parliament on Monday adopted a motion by the president to impose it for 30 days.

Ukrainian soldiers were digging trenches on the frontline on Wednesday as the latest crisis between Ukraine and Russia showed no signs of abating.

Russian Foreign Minister Sergey Lavrov said on Wednesday that Russian border control have documented proof that Ukrainian ships did violate the sea border with Russia in Kerch.

Ukrainian authorities claim Russia is blockading its ports in the Sea of Azov.

NATO foreign ministers met on Tuesday to debate ways to dissuade Moscow from destabilising Ukraine and respect a landmark Cold-war era nuclear treaty.

Bad weather conditions were hampering rescue efforts in the Black Sea on Tuesday, a day after at least 14 sailors were killed when two commercial vessels caught fire, Kerch city authorities said.

A Moscow court on Wednesday rejected an appeal by a group of Ukrainian sailors against the extension of their pre-trial detention.

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Azerbaijan, Georgia, Romania and Turkmenistan have signed an agreement to open up a new freight route between the Caspian and Black Seas, connecting Central Asia and Central Europe.

A Russian court on Wednesday extended the detention term for some of the 24 Ukrainian sailors' detained for breaching the Russian border in the Kerch Strait.

A Russian court turned down an appeal by Ukrainian sailors captured by the Russian navy after a clash in the Kerch Strait.

Avant que la ferveur olympique empare de la station de Rosa Khoutor, ou se derouleront les epreuves de ski alpin, les touristes profitent des pistes ensoleillees et du panorama exceptionnel qu offre le domaine de Gornaia Karoussel, avec...

Sochis hotels and guesthouses are preparing for an unprecedented winter as thousands of visitors descend on the Black Sea resort CLEAN : Russian hotels gear up to receive Olympic on January 12, 2014 in Sochi, Russia (Footage by AFPTV...

Under the burning sun in Romania's Midia port on the Black Sea the Lady Maria stands ready to embark its passengers thousands of sheep to be shipped to Libya for the Eid al-Adha holiday (Footage by AFPTV via Getty Images)

Georgia's parliament confirms controversial interior minister Giorgi Gakharia as prime minister fuelling a tense political situation in the Black Sea nation (Footage by AFPTV via Getty Images)

The NATO Secretary General Jens Stoltenberg on Wednesday was welcomed in Ukraine, saying the visit "sends a clear message that NATO stands in solidarity" with the country.

In the Black Sea a French warship patrols international waters under the watchful eye of the Russian army (Footage by AFPTV via Getty Images)

Cafes, restaurants and shopping malls reopen in Georgia, as the Black Sea country that has confirmed fewer than 800 coronavirus cases continues to ease lockdown measures (Footage by AFPTV via Getty Images)

Aug.24 -- Turkey says its natural gas find in the Black Sea will likely be followed by further discoveries, altering the geopolitics of energy trade in its region. President Recip Tayyip Erdogan's spokesman Ibrahim Kalin spoke...

Former U.S. Ambassador to NATO, Kay Bailey Hutchison, discusses coalition partnerships in Ukraine, including Sweden and Finland. She speaks with David Westin on Bloomberg's "Balance of Power."

A cancer treatment hospital and an eye clinic suffer damage in bombardments of the city of Mykolaiv, near the strategic Black Sea port of Odessa, a few days after a maternity hospital in Mariupol was shelled (Footage by AFPTV via Getty...