Ukraine on Friday announced it was barring entry to Russian men between 16-60 years and a senior state security official said Kiev was considering whether to respond in kind with "mirror actions" to the Black Sea incident.
The naval boats had been sailing from Odessa to Mariupol, a Ukrainian port on the Azov sea, when they were confronted by the FSB vessels.
Volker said he has not received independent US verification of Ukraine's information, but believed "the data the Ukrainians have provided is quite clear".
President Poroshenko said the global community must not accept Russia's aggressive policy, in an interview with German newspaper Bild.
On Thursday, U.S. President Donald Trump announced that he was canceling planned talks with Putin over the issue. Thus, both sides perceive the Strait as an important key structure.
Putin insisted that Russia's military response was appropriate as the Ukrainians had "trespassed" into Russia's territorial waters. But these are two countries that have been symbiotic for decades, and it'll hurt Ukrainians as much as Russians. "The aggressor-state is striving in any way to prevent the Crimea from returning to Ukraine's jurisdiction, to counterbalance the USA and North Atlantic Treaty Organisation efforts on the eastern flank of the Alliance and expand its military presence in the Mediterranean", he said.
'Don't believe Putin's lies, ' he told Bild, Germany's biggest-selling paper, comparing Russia's protestations of innocence in the affair to Moscow's 2014 denial that it had soldiers in Crimea even as they moved to annex it.
Kremlin spokesman Dmitry Peskov said that Poroshenko's request is "clearly aimed at provoking further tensions" and driven by the Ukrainian leader's 'electoral and domestic policy motives'.
There are rumblings that Ukraine will call for the closure of the Bosphorus Strait to Russian Navy traffic as a result of Moscow's recent acts, which would cut off the Black Sea Fleet from the Mediterranean.
But Ukraine and foreign observers said it marked the culmination of a yearslong effort by Moscow to force its authority on the Sea of Azov, the waters of which are shared between the two countries, according to a 2003 agreement.
While the world refused to recognize the new reality, Russian Federation began to impose rules for ships transiting the strait, including 48 hours notice to get permission.
As UNIAN reported, three Ukrainian vessels were captured on November 25 by Russian forces at sea near the Kerch Strait, which is the only outlet to the Sea of Azov and controls access to two major Ukrainian ports. Russian Federation has also supported separatists in Ukraine's east with clandestine dispatches of troops and weapons.
The peninsula existed as a semi-autonomous region of Ukraine, with political bonds to Kyiv but strong cultural ties to Moscow.
The Ukrainian vessels refused to obey Russian directives to halt. It's apparently created to prevent Moscow from forming "private armies" on Ukrainian soil.
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