By expanding the arena of fighting in the region, experts say, Tehran sent a warning about the dangers of a widening war.

© Pete Marovich for The New York Times

During a fleeting truce, Iranians covertly devised a plan to raise the war’s costs for President Trump if U.S. forces attacked anew.

© Hadi Mizban/Associated Press

Facing attacks by Yemen’s Houthi militia, Saudi Arabia has invited dozens of countries to assist it in protecting shipping in the Red Sea, diplomats say.

© Khaled Ziad/Agence France-Presse — Getty Images

The kingdom is being dragged deeper into the wider regional conflict as it faces attacks from Iraq and Yemen.

© Copernicus Sentinel-2, via Reuters