This week's G7 summit in Canada will be dominated by war - only not one of those that the world leaders had expected.
High on the agenda had been Russia's war against Ukraine and Donald Trump's tariff war against America's trading partners.
Instead the three-day gathering in the Rocky Mountains of Alberta will inevitably be focused on war in the Middle East.
Israel's decision to attack Iran will force the Group of Seven western powers to spend less time on other issues and instead discuss ways of managing the conflict.
Like so many of their discussions, that will involve Britain, France, Germany and Italy - along with Canada and Japan - seeking to influence the United States.
For although Israel might have launched these strikes without explicit American support, the US president is the only leader with real leverage over Prime Minister Benjamin Netanyahu.
The G7 leaders, due to arrive in Canada on Sunday, know the global security and economic risks if this conflict escalates, dragging in other countries, sending oil prices soaring.
Yet they may struggle to achieve a common position. Some, such as UK Prime Minister Keir Starmer and President Emmanuel Macron of France, have called for restraint and de-escalation.
But others such as Japan's Prime Minister, Shigeru Ishiba, have condemned Israel's attack as "intolerable" and "extremely regrettable". For his part, Mr Trump praised Israel's strikes as "excellent".