U.S. President Donald Trump and his NATO counterparts are gathering this week for what might be a historic summit.

Canada is hosting a Group of Seven meeting that will include U.S. President Donald Trump, who is waging a trade war against ...

Small and informal groupings are becoming the diplomatic vehicles of choice in a polarized world, writes Charles A. Kupchan.

The Group of Seven (G7) summit begins a final day of deliberations in Canada on Tuesday, but without a key player: US ...