When Israel launched its series of strikes against Iran last week, it also issued a number of dire warnings about the country’s nuclear program, suggesting Iran was fast approaching a point of no return in its quest to obtain nuclear weapons and that the strikes were necessary to preempt that outcome.

The back-and-forth has raised concerns about all-out war between the countries and propelled the region, already on edge, into even greater upheaval.

Israel's air campaign on the Iranian capital appeared to broaden on the fourth day of an intensifying conflict after it issued warnings on Monday for about 300,000 people in Tehran to evacuate ahead o...