Three sailors have been wounded after the Ukrainian navy said two artillery boats were hit by the strikes in the Black Sea.
Ukraine’s President Petro Poroshenko called an emergency session of his war cabinet and said he will propose that parliament declare martial law.
Russia’s Federal Security Service (FSB) said it used weapons after the Ukrainian ships ignored demands to stop and that it impounded three vessels which had illegally crossed the border.
The three injured sailors are receiving medical treatment and their lives are not in danger, the FSB said.
Ukraine’s ambassador to the UK said Russian special forces had captured two armoured artillery boats and a tugboat in an “act of aggression”.
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