G20 leaders meeting at Rio de Janeiro's Modern Art Museum for a two-day summit tackled an agenda that reflected a shifting global order, trying to shore up multilateral consensus before U.S. President-elect Donald Trump returns to power in January.

G20 leaders met in Rio de Janeiro on Monday for talks on climate change, ongoing wars in Ukraine, Gaza and Lebanon, and more, at a forum that highlighted differences between world powers but also delivered some successes.

Leaders of the Group of 20 major economies began arriving on Monday at Rio de Janeiro's Modern Art Museum for their annual summit, bracing for a shift in the global order with the return to power of U.

With leaders from the world's biggest economies converging on Rio de Janeiro for a two-day G20 summit starting Monday, the usually relaxed seaside city is under a tight security blanket.