Leaders of many of the world's biggest economic powers began arriving in the Canadian Rockies on Sunday for a Group of Seven summit, an event overshadowed by an escalating conflict between Israel and Iran and President Trump's unresolved trade war with allies and rivals alike. Israel's strikes on Iran and Tehran's retaliation appeared to catch many world leaders by surprise, the AP reports. UK Prime Minister Keir Starmer said he had discussed efforts to deescalate the crisis with Trump and Israeli Prime Minister Benjamin Netanyahu, as well as other world leaders, and said he expected "intense discussions" at the summit. Trump is attending, as is Ukrainian President Volodymyr Zelensky.