The excercise named ‘Formidable Shield’ brings armed forces from eight countries together in the Outer Hebrides.
An international missile defence exercise is under way in Scotland as the row between the United States and North Korea intensifies.
The US-led operation got under way in the Outer Hebrides this week and will last for a month.
Formidable Shield brings together armed forces from eight countries and involves 13 ships.
They will work together to shoot down live missiles fired from the Hebrides Range.
Defence secretary Sir Michael Fallon said escalating tensions with North Korea made the exercise – which has been planned for several months – even more important.
“North Korean tests have shown the danger of rogue states developing longer range missiles,” he said.
“By hosting this cutting-edge exercise in anti-missile defence with allied navies Britain is at the forefront of developing a more effective response to this growing threat.”