BRISBANE, AUSTRALIA - NOVEMBER 16:  British Prime Minister David Cameron speaks at a press conference during the G20 Summit on November 16, 2014 in Brisbane, Australia. Cameron spoke on Russia's handling of the crisis in Ukraine. World leaders have gathered in Brisbane for the annual G20 Summit and are expected to discuss economic growth, free trade and climate change as well as pressing issues including the situation in Ukraine and the Ebola crisis.  (Photo by Glenn Hunt/Getty Images)