Ukraine's military says an officer has been killed in an attack on a base in Crimea, the first such death since pro-Russia forces took control in February.
An eyewitness told the BBC that armed men arrived in two unmarked vehicles, storming the base in Simferopol and firing automatic weapons.
A junior officer who was on duty in a park inside the base had been killed and another officer injured. A third serviceman had leg and head injuries after being beaten with iron bars Ukraine has now authorised its troops to fire in self-defence.
Ukraine has now authorised its troops to fire in self-defence.