World leaders will meet for the start of a Nato summit in Newport tomorrow.
ITV News Correspondent Rupert Evelyn has tweeted:
US President Barack Obama has just landed on Air Force One at Fairford in Gloucestershire
Barack Obama will now transfer to Marine One and travel to the Nato talks in Newport #NATOSummitWales
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.