Petro Poroshenko, Ukraine's president, gestures as he speaks during a Bloomberg Television interview during the World Economic Forum (WEF) in Davos, Switzerland, on Tuesday, Jan. 17, 2017. World leaders, influential executives, bankers and policy makers attend the 47th annual meeting of the World Economic Forum in Davos from Jan. 17 - 20. Photographer: Simon Dawson/Bloomberg via Getty Images
