US President Barack Obama (2nd L) attends a news conference with (L-R) European Council President Herman Van Rompuy, European Commission President Jose Manuel Barroso and Britain's Prime Minister David Cameron at the G8 summit in Enniskillen, Northern Ireland June 17, 2013. [Photo/Agencies]

US President Barack Obama and Britain's Prime Minister David Cameron speak with students as they work on a school project about the G8 summit during a visit to the Enniskillen Integrated Primary School in Enniskillen, Northern Ireland June 17, 2013. [Photo/Agencies]