International war games involving 14 Nato nations are under way in Scotland.

Around 5700 military personnel from around the world are participating in Operation Joint Warrior, along with 67 aircraft and 31 warships and submarines.

The bi-annual war games, which began on Saturday, coincide with Unmanned Warrior, the world's first large-scale demonstration of drone warfare.

Trials involving anti-submarine manoeuvres and electronic warfare will be carried out off the west coast, at RAF Lossiemouth and at Prestwick until October 20.

A Royal Navy spokesman said: "The massive military exercise happens twice a year and provides the UK, Nato allies and partners with the chance to practice the skills needed for current and future operations.

"Joint Task Force training, anti-submarine and anti-surface warfare, mine countermeasures, intelligence-gathering, GPS jamming and electronic warfare training will all take place.

"Joint Warrior and its predecessors, Neptune Warrior and the Joint Maritime Course, have been run in the exercise areas off Scotland for decades, providing generations of sailors, soldiers and airmen the chance to develop their war fighting skills."