BBC visits Ukraine's last base in Crimea
24 March 2014 Last updated at 14:13 GMT
Russian troops have taken control of a Crimean naval base at Feodosia, the third such attack in 48 hours, Ukrainian officials have told the BBC.
Defence spokesman Vladislav Seleznyov said the Russians had attacked the base from two directions using armoured personnel carriers and stun grenades.
Ukraine now controls just one police base in the entire Crimean region, from where Mark Lowen reports.