JERUSALEM (AP) — Israel is vowing to retaliate against Iran, risking further expanding the shadow war between the two foes into a direct conflict after an Iranian attack over the weekend sent hundreds of drones and missiles toward Israel.

Israeli officials have not said how or when they might strike. But as countries around the world urge Israel to show restraint and the threat of a multi-front war mounts, it’s clear that a direct Israeli attack on Iranian soil would lead to major fallout.

Iran says it carried out the strike to avenge an Israeli airstrike that killed two Iranian generals in Syria on April 1. It has pledged a much tougher response to any Israeli counterattack attack on its soil.

With Israel focused on its war against Hamas in Gaza, and already battling Iranian-backed Hezbollah militants in Lebanon every day, the U.S. has urged Israel to show restraint.

U.S. officials say President Joe Biden has told Israeli Prime Minister Benjamin Netanyahu that the U.S. will not participate in any offensive action against Iran, and the president made “very clear” to Netanyahu “that we do have to think carefully and strategically” about the risks of escalation.

Israel’s war cabinet has spent the last two days debating their next move. Here are some considerations key to their decision.