'Enemy forces, we're coming for you': Why NATO's descended on Scotland

Twelve NATO countries have joined forces to take part in Joint Warrior, a major exercise off the coast of the UK.

Exercise Joint Warrior 212 involves dozens of pieces of air and sea hardware, and personnel from Belgium, Canada, France, Germany, Latvia, Netherlands, Norway, Romania, Portugal, Spain, the United Kingdom and the United States.

Among the ships taking part in the exercise is Queen Elizabeth-class aircraft carrier HMS Prince of Wales, which the Royal Navy refused to deny was involved in an encounter with a Russian vessel off the Scottish coast.

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Joint Warrior 212 brings together two of NATO's active duty standing forces, Standing NATO Maritime Group One (SNMG1) and Standing NATO Mine Countermeasures Group One (SNMCMG1).

The exercise has also featured the first landing of Commando Helicopter Force's Wildcat helicopters on board Prince of Wales.

Other British vessels are also involved in Joint Warrior 212, like HMS Explorer, which tweeted: "Enemy forces have arrived and we're coming for you."