Demonstrators from the 'IF campaign' wearing masks depicting G8 leaders protest against tax avoidance during the G8 Summit in Enniskillen, in Northern Ireland, on June 17, 2013. US President Barack Obama and world leaders arrived in Northern Ireland for the G8 summit on Monday looking to put pressure on Russia to back away from its support of Syrian President Bashar al-Assad.  AFP PHOTO / BERTRAND LANGLOIS        (Photo credit should read BERTRAND LANGLOIS/AFP via Getty Images)