Leaders of the Group of 20 major economies have gathered in Rio de Janeiro for their annual summit, facing geopolitical tensions and uncertainty with the return of U.S. president-elect Donald Trump. The discussions on trade, climate change, and international security will be impacted by the sharp policy changes that Trump plans to implement upon taking office in January. The summit is also marked by the wars in Gaza and Ukraine, with diplomats struggling to reach an agreement on addressing the Ukraine conflict. Security has been strengthened in Rio de Janeiro for the duration of the summit. Brazilian officials acknowledge that their agenda for the G20 may face obstacles with Trump's new global priorities.