ukraine's defense ministry says one of its officers has been killed. another is in the hospital after an incident near a military base. the killing is on the very same day that russia's president declared crimea part of the russian federation. let's go straight there to cnn's international anchor michael holmes, who is in crimea. and michael, tell me more about this officer who's been killed. >> reporter: for the last couple of weeks, brooke, there has been various degrees of blockading of ukrainian military bases in crimea. it's generally been uneventful. but that changed a few hours ago. what you can call a fairly inconsequencial base. there is a base that deals with things like topography. what happened was some masked and armed men raided that base, went on to the base and somehow shooting erupted.