Nato's Secretary General has said that Russia must "pull back its troops" and weapons.
Anders Fogh Rasmussen said: "We continue to call on Russia to pull back its troops from Ukraine's borders. Stop the flow of weapons and fighters into Ukraine. Stop the support for armed militants."
Angus Raffle, 8, says his surprise meeting with the President at Stonehenge was "awesome". His mother says she "squealed like a teenager".
The language has been ramped up at this Nato summit, yet caution appears the order of the day after the mistakes of recent history.
The US President's motorcade pulled up at the school with his black stretch limousine bearing a Welsh flag for the first time in history.