The leaders of the G20 are meeting in Buenos Aires amid growing geopolitical and trade tensions. The Summit is a long shot from 2009, the first time it was held at the leaders' level. Back then, governments of the 19 industrialized nations (plus the EU) managed to avoid a major trade war in the face of the worst economic recession since 1929. Today, the US-China trade war is on, the conflict between Russia and Ukraine is flaring up again, and the Khashoggi case continues to haunt Saudi Arabia. What awaits world leaders at this year's summit? Will the G20 bridge differences, or will it be a place for simmering tensions to resurface?