The head of radical leftist Syriza party Alexis Tsipras waves to supporters after winning the elections in Athens January 25, 2015. Tsipras promised on Sunday that five years of austerity, "humiliation and suffering" imposed by international creditors were over after his Syriza party swept to victory in a snap election on Sunday. REUTERS/Marko Djurica (GREECE - Tags: POLITICS ELECTIONS)