G20 leaders meet in Brazil for annual summit amid concerns over the global order due to Trump's return to power. Discussions on trade, climate change, and international security will face challenges from Trump's policy changes. China's role in the Ukraine conflict is under scrutiny, and Germany believes Beijing's position may become harder to sustain. Diplomats drafting a joint statement on the Ukraine war struggle to maintain consensus. Brazil's G20 agenda focused on sustainable development and fighting poverty may lose steam with Trump's new global priorities. Trade talks will be stoked by concerns of an escalation in the US-China trade war.