(2) what investigation has been conducted by (a) the Royal Air Force and (b) his Department into Russian aircraft flying into restricted UK airspace over Na h-Eileanan an Iar.
No Russian or any other foreign military aircraft have ever entered any part of UK sovereign airspace without permission.
All events where quick reaction alert aircraft have been launched are routinely collated and analysed by Defence officials.
The RAF's air defence capability to detect and deter aircraft approaching UK airspace is just one layer of a multi-layered approach that the UK Government take to protect UK and NATO-monitored airspace.