Is­rael and the Unit­ed States pound­ed Iran on Mon­day in a cam­paign that U.S. Pres­i­dent Don­ald Trump said would like­ly take sev­er­al weeks. Tehran and its al­lies hit back against Is­rael, Gulf states and tar­gets crit­i­cal to the world’s en­er­gy pro­duc­tion.

The in­ten­si­ty of the at­tacks, the killing of Iran­ian Supreme Leader Ay­a­tol­lah Ali Khamenei, and the lack of any ap­par­ent ex­it plan set the stage for a pro­longed con­flict with far-reach­ing con­se­quences. Safe havens in the Mideast like Dubai have seen in­com­ing fire; hun­dreds of thou­sands of air­line pas­sen­gers are strand­ed around the globe; oil prices shot up; and U.S. al­lies pledged to help stop Iran­ian mis­siles and drones.

With no sign of the con­flict abat­ing any­time soon, Trump said op­er­a­tions are like­ly to last four to five weeks but that he was pre­pared “to go far longer than that.”