The Arc de Triomphe in Paris, which the president vows to top in Washington, offers a lesson in the complicated history of monuments.

European politicians risk angering their voters if they join America’s war. Yet they could also face domestic upheaval if they take no action to reopen shipping routes that Iran has blocked and ease an energy crisis.

France’s far right hoped for major gains in Sunday’s municipal elections, a key bellwether moment before a presidential election next year. Its results were mixed.

The far-right party had first-round successes in several cities, but so did the far left. Sunday’s second round may clarify who has real momentum.

Voters across France choose mayors this week. The far right is performing strongly in the country’s second city, making the contest there a test of national shifts.

From London to Rome and beyond, leaders are facing diplomatic headwinds and criticism at home as they take part in a conflict they did not seek.

Disregarded by President Trump over Iran, Europe’s leaders are adapting to a world in which they are little more than bystanders.