LONDON, ENGLAND - MAY 01: President of the United Arab Emirates, Sheikh Khalifa bin Zayed Al Nahyan looks at a photographic exhibition during his visit to Clarence House on May 1, 2013 in London, England. The President of the United Arab Emirates is paying a two-day State visit to the United Kingdom, staying in Windsor Castle as the guest of Her Majesty The Queen from April 30, 2013 to May 1, 2013. (Photo by John Stillwell - WPA Pool/Getty Images)
