Russia has moved Mig-31 interceptors close to Ukrainian border
An unspecified amount of Mig-31s based at Perm have been deployed to Millerovo airfield, in the Rostov region, close to the border with Ukraine. This is a sign that Moscow may be preparing to actively control the airspace over Luhansk Oblast. The MiG-31 is a two-seater derivative of the MiG-25 in service since 1983.