P.M. Edition for Dec. 16. Conflicts once viewed as disconnected have merged into what could be the opening shots of a massive confrontation. Chief foreign-affairs correspondent Yaroslav Trofimov reports on how opposing alliances are preparing. And President-elect Donald Trump and SoftBank CEO Masayoshi Son announce a $100 billion investment in U.S. projects. Plus, police say a student at a Christian school in Madison, Wis., is believed to have fatally shot at least two people. Pierre Bienaimé hosts.

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