Russia blocked the Kerch Strait from Ukrainian ships after a series of incidents reported by the Ukrainian Navy.
At the beginning the Russian ship rammed the Ukrainian tugboat.
Later ukrainians reported also about shelling their ships from land and from the sea.
Russian media report that Su-25 fighters flew out from the Crimea to the Strait.
For several months, Russia has been stopping ships sailing to Ukrainian ports in the Azov Sea.
Russia also controls the Kerch Strait, which connects Azov Sea with the Black Sea, and built a bridge over it from Russia to the annexed Crimea.
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