Prime Minister David Cameron Holds Trilateral Summit With Afghanistan's President Karzai And Pakistan's President Zardari

CHEQUERS, ENGLAND - FEBRUARY 04: Britain's Prime Minister David Cameron (C) shakes hands with Afghan President Hamid Karzai (L) and Pakistani President Asif Ali Zardari (R) at the Prime Minister's official country residence, near Aylesbury in Buckinghamshire on February 4, 2013 in Chequers, England. The three leaders started these trilateral talks last year and are due now to focus on cross border security and methods to engage the Taliban in effective peace talks. (Photo by Adrian Dennis - WPA Pool/Getty Images)