World leaders gathered in Japan Friday for one of the most high-stakes and fractious Group of Twenty (G20) meetings in years, with a bruising United States (US)-China trade war, geopolitical tensions, and climate change on the agenda.The two-day summit in the city of Osaka will be dominated by trade issues, with all eyes on whether US President Donald Trump and Chinese President Xi Jinping can reach a truce in a dispute that has been hugely damaging for the world economy.But world leaders wil