While protesters fill the streets of Hamburg on Friday outside the G-20 summit, President Trump will be inside meeting with more than a half-dozen world leaders during a day that will test his mettle on the international stage and shape ways the U.S. responds to a number of foreign policy crises.

Trump’s highly anticipated meeting with Russian President Vladimir Putin consumed much of the intrigue surrounding the annual gathering of the world’s largest economies in the days leading up to the G-20.