Ukrainian President Petro Poroshenko has tweeted this photo showing him discussing the crisis in his country with other Nato leaders.
The seated figures are (L-R): French President Francois Hollande, President Poroshenko, US President Barack Obama, Prime Minister David Cameron and German Chancellor Angela Merkel. The sixth figure is believed to be Italian Prime Minister Matteo Renzi.
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.