Portuguese Air Force fighter F-16 (R) and Canadian Air Force fighter CF-18 Hornet patrol over Baltics air space, from the Zokniai air base near Siauliai November 20. Nato pilots practised scrambling their jets on Wednesday, in preparation for potential further unauthorised Russian jets encountered on Baltic patrols. The flight drills were part of the Nato Baltic Air Policing Mission, a collective defence project which has been running for a decade. Reuters/Ints Kalnins