Ukrainian Navy vessels – two small-sized 'Berdiansk' and 'Nikopol' armored artillery boats and the 'Yany Kapu' tugboat – that were captured by Russia's coast guards in the Sea of Azov have been transported to the port of Kerch in the occupied Crimea.

Head of the Russian border guards in the occupied Crimea, Anton Lozovoi, says that three wounded Ukrainian troops have been allegedly provided medical assistance, according to the Russian news agency TASS.

The FSB also informed that a criminal case had been opened following what they called "violation of the state border of the Russian Federation."

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Read alsoRussia fires to kill: Ukraine's General Staff elaborates on Russian attack on Ukrainian ships

As UNIAN reported earlier, Russian coast guard ships opened fire on a group of vessels of the Ukrainian Navy – two small-sized 'Berdiansk' and 'Nikopol' armored artillery boats and the 'Yany Kapu' tugboat – as they were leaving the Kerch Strait on Sunday evening.

Later, it became known that a Russian special ops unit had seized all the three Ukrainian boats when they were leaving the Kerch Strait. Six members of Ukraine's Navy were reportedly wounded, two of them were in serious condition.

Ukraine's presidential envoy to the Autonomous Republic of Crimea Borys Babin wrote on Facebook that at there were least two dozen prisoners of war as a result of a recent act of Russian aggression.