Group of Seven leaders arrived in Kananaskis, Alberta, Canada, on Sunday for three days of intense discussion amid increased tension in the Middle East and President Donald Trump’s reshaping of global alliances.

The annual meeting marks the 50th anniversary of the G7 summit for the leading industrialized nations of Canada, France, Germany, Italy, Japan, the United Kingdom, and the United States. Representatives from the European Union and other heads of state will also be in attendance.