Admiral Denis Berezovsky was earlier shown on Russian television swearing allegiance to the pro-Russian regional leaders of Crimea.
Russian forces have seized Crimea peninsula and told Ukrainian forces there to give up their weapons.
“During the blockade by Russian forces of the central headquarters of the navy, he declined to offer resistance and laid down his weapons,” said Viktoria Syumar, deputy secretary of Ukraine’s Security Council.
“The prosecutor’s office has opened a criminal case against Denis Berezovsky under statute 111: state treason,” she said.
Another admiral, Serhiy Hayduk, was placed in charge of the navy. (Reuters)
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