Early Friday morning, Israel attacked military installations near the Iranian cities of Isfahan and nearby Natanz, the latter being one of the hubs of the country’s nuclear program. Jerusalem is not taking credit for the attack, and none of the details are too certain, but it seems that the attack involved multiple drones, likely launched from within Iran, as well as one or more missiles fired from Syrian or Iraqi airspace. Strikes on Syrian radar systems shortly beforehand probably helped make the attack possible, and there were reportedly strikes on Iraq as well.

Iran itself is downplaying the attack, but the S-300 air-defense batteries in Isfahan appear to have been destroyed or damaged. This is a sophisticated Russian-made system positioned to protect the Natanz nuclear installation. In other words, Israel has demonstrated that Iran’s best technology can’t protect the country’s skies from the IDF. As Yossi Kuperwasser puts it, the attack, combined with the response to the assault on April 13,

clarified to the Iranians that whereas we [Israelis] are not as vulnerable as they thought, they are more vulnerable than they thought. They have difficulty hitting us, but we have no difficulty hitting them.

Nobody knows exactly how the operation was carried out. . . . It is good that a question mark hovers over . . . what exactly Israel did. Let’s keep them wondering. It is good for deniability and good for keeping the enemy uncertain.

The fact that we chose targets that were in the vicinity of a major nuclear facility but were linked to the Iranian missile and air forces was a good message. It communicated that we can reach other targets as well but, as we don’t want escalation, we chose targets nearby that were involved in the attack against Israel. I think it sends the message that if we want to, we can send a stronger message. Israel is not seeking escalation at the moment.

The editors of the Wall Street Journal rightly call the Biden administration’s new policy an arms embargo. (Subscription required.)

The administration would like to focus on the denial of 2,000-pound bombs, which it says are too destructive. Never mind that a professional force can employ them in a manner that restricts the radius of damage. Mr. Biden is also halting a shipment of 500-pound bombs and holding up Joint Direct Attack Munitions (JDAMs), which convert unguided bombs into precision “smart” bombs. Politico reports that small-diameter bombs are being withheld. The Journal adds that the Biden administration has been sitting on a deal that includes tank shells and mortar rounds.

The message from the White House, in other words, is that Israel shouldn’t have large bombs or small bombs, dumb bombs or smart bombs, and let it do without tanks and artillery too. Now isn’t a good time to send the weapons, you see, because Israel would use them.

But it’s even worse than that: withholding the JDAMs in effect encourages Israel to use dumb bombs in instances when precision weapons would be more effective, and less likely to cause harm to bystanders. And then there is the twisted logic behind the decision:

Defense Secretary Lloyd Austin and other U.S. officials explain that the goal of the embargo—which they present as a “pause” or “review”—is to prevent a wider Israeli attack on the Hamas stronghold of Rafah. This is the terrorists’ reward for using civilians as human shields.

It hasn’t been four weeks since Iran attacked Israel directly, in the largest drone attack in history, plus 150 or so ballistic and cruise missiles. . . . Israel needs to be ready now, and its enemies need to know the U.S. stands behind it.