World leaders gather as G20 summit starts in Buenos Aires

World leaders are beginning to arrive at the G20 summit in Buenos Aires.

Migration, climate change, and global trade tensions will be high on the agenda at the meeting, where Chinese President Xi Jinping and US President Donald Trump are set to go head-to-head over soaring import tariffs.

Trump and Russian President Vladimir Putin will also be in the spotlight after the pair were supposed to sit down together for a high profile meeting until the Rendez-Vous was canceled at the last minute over Russia’s Black Sea dispute with Ukraine.