What underlies US-China trade war tensions ahead of crucial G20 meeting?

US President Donald Trump and Chinese President Xi Jinping are expected to meet on the sidelines of the G20 summit in Argentina this week for what some see as the most important meeting in years between the leaders of the world's two largest economies.

After months of bitter bickering between their governments over trade and security that has raised questions about the very future of a complex but economically pivotal relationship, the two leaders took a step back from the edge with an ice-breaking telephone call early this month. They.....

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