The crews of two helicopters shot down in south east Ukraine have been evacuated, the country's defence ministry has said.
It also called for the release of a "heavily-wounded pilot" who was pictured being taken by pro-Russian separatists broadcast on Russian state media.
In a statement, the ministry said: "One heavy-wounded pilot was captured by extremists who waited for the emergency landing of the helicopter. His location is known. [The government has] taken measures for his urgent liberation."