epa06072749 A handout photo made available by the German Government on 07 July 2017 of US President Donald J. Trump (L) shaking hands with Russian President Vladimir Putin during the retreat at the opening day of the G20 summit in Hamburg, Germany, 07 July 2017. The G20 Summit (or G-20 or Group of Twenty) is an international forum for governments from 20 major economies. The summit is taking place in Hamburg 07 to 08 July 2017. EPA/STEFFEN KUGLER HANDOUT HANDOUT EDITORIAL USE ONLY/NO SALES