BANFF, Canada — President Donald Trump opened the 2025 Group of Seven leaders’ summit by complaining it was a “mistake” for the multilateral organization to remove Russia from its ranks.

“The G7 used to be the G8. [Former President] Barack Obama and a person named [former Canadian Prime Minister Justin] Trudeau didn’t want to have Russia in, and I would say that was a mistake because I think you wouldn’t have a war right now if you had Russia in,” Trump told reporters on Monday.