With No Clear Off-Ramp, Israel’s War With Iran May Last Weeks, Not Days

When Israel and Iran clashed last year, they fought in short and contained bursts that usually ended within hours, and both sides looked for off-ramps that allowed tensions to ebb.

Since Israel started a new round of fighting on Friday, the two countries have said they will continue for as long as necessary, broadening the scope of their attacks and leading to much higher casualty counts in both countries. This time, the conflict appears set to last for at least a week, with both Israel and Iran ignoring routes toward de-confliction.

Israel seems motivated to continue until the destruction of Iran’s nuclear enrichment program, either by force or renewed negotiations. Yet Iran has shown no sign of voluntarily ending enrichment, a process crucial to building a nuclear bomb, and Israel has no known ability to destroy a pivotal enrichment site that is buried deep underground.

“We’re weeks rather than days away from this ending,” said Daniel B. Shapiro, who oversaw Middle Eastern affairs at the Pentagon until January.

“Israel will keep going until, one way or another, Iran no longer retains an enrichment capability,” added Mr. Shapiro, now a fellow at the Atlantic Council, a Washington-based research group. “It’s now clear that if Israel leaves this unaddressed, its campaign will have failed.”

While Israel has easily struck Iran’s main enrichment site at Natanz, central Iran, it lacks the American-made “bunker-buster” bombs needed to destroy a smaller subterranean site dug deep into a mountain near Fordo, northern Iran. Israeli officials hope that their strikes on other targets — including Iran’s top military commanders, nuclear scientists and its energy industry — will inflict enough pain to encourage Iran to willingly end operations at Fordo.