On the same day Donald Trump and Xi Jinping struck a trade war truce, Canadian authorities made an arrest that now threatens to make the U.S.-China conflict much worse.

China won’t find it easy to make good on its promise to crack down on fentanyl as part of its trade war truce with U.S. President Donald Trump.

Increasing wariness in Washington over China’s investments in U.S. biotechnology companies may cool a hot source of capital for medical startups.

Envoys from almost 200 countries convene this week in Katowice, Poland, for an annual conference on reining in global warming.

Differences on difficult issues such as Chinese industrial policy and intellectual property regimes remain vast — and tough negotiations now lie ahead.