The Nato summit is under way in Wales, with the organisation's response to the growing crisis in Ukraine top of the agenda.

The alliance is expected to agree plans to create a rapid reaction force of around 5,000 troops ready to deploy to eastern Europe within 48 hours.

But Nato is also investing in its intelligence gathering, spending more than £1bn ($1.7bn) on new unmanned spy planes or drones.

Nato forces have already been carrying out trials of their ability to gather and share intelligence in a recent exercise in Norway.

Defence Correspondent Jonathan Beale reports