Leaders of some of the world’s biggest economic powers will arrive in the Canadian Rockies on Sunday for a Group of Seven summit overshadowed by a widening war across the Middle East and U.S. President Donald Trump’s unresolved trade war with allies and rivals alike.

Canada is hosting this year’s G7 meeting – it’s the seventh time it has assumed the presidency of the group. Besides leaders of the G7 countries and the EU, which is also represented at the summit, Canadian Prime Minister Mark Carney has invited several heads of state from non-G7 countries as guests.