For the second time in nearly two weeks, the United States carried out airstrikes against a facility used by Iran’s Islamic Revolutionary Guards Corps and its proxies in eastern Syria early Thursday, ratcheting up retaliation for a steady stream of rocket and drone attacks against American forces in Iraq and Syria.
The strikes by two Air Force F-15E jets against a weapons warehouse in Deir al Zour Province, Syria, came after U.S. airstrikes on Oct. 27 against similar targets in eastern Syria failed to deter Iran or its proxies in Syria and Iraq, which the Biden administration has blamed for the attacks.
Not only have the attacks continued — there have been at least 22 more since the American retaliatory strikes last month — but Pentagon officials said they have become more dangerous. Iran-backed militias have packed even larger loads of explosives — more than 80 pounds — onto drones launched at American bases, U.S. officials said.
“This precision self-defense strike is a response to a series of attacks against U.S. personnel in Iraq and Syria by I.R.G.C.-Quds Force affiliates,” Defense Secretary Lloyd J. Austin III said in a statement. “The president has no higher priority than the safety of U.S. personnel, and he directed today’s action to make clear that the United States will defend itself, its personnel, and its interests.”
“The United States is fully prepared to take further necessary measures to protect our people and our facilities,” he added. “We urge against any escalation.”
The strikes also came after the Pentagon said a U.S. military MQ-9 Reaper surveillance drone was shot down over the Red Sea off the coast of Yemen on Wednesday by Iran-backed Houthi rebels.
The downing of the drone, the mainstay of the American military’s aerial surveillance fleet, was another escalation of violence between the United States and Iran-backed groups in the region. The episode underscored the risks that the conflict between Israel and the Palestinian group Hamas could spiral into a wider war.
Biden administration officials have been trying to calculate how to deter the Iranian-backed Shiite militias from attacking American troops in the region without sparking that broader conflict, said three administration officials, who spoke on the condition of anonymity to discuss internal planning.
“The attacks, the threats coming from militia that are aligned with Iran, are totally unacceptable,” Secretary of State Antony J. Blinken said in Iraq on Sunday.
The Pentagon said on Wednesday that there had been at least 41 attacks on U.S. forces in Syria and Iraq since Oct. 17 and that at least 46 U.S. service members had been injured, 25 of whom had suffered traumatic brain injuries. The United States has 2,500 troops in Iraq and 900 in Syria, mostly to help local forces fight remnants of the Islamic State.
In meetings to select targets, U.S. officials try to game out what response each strike will bring, one official said. Military officials at the Pentagon’s Central Command and in the American intelligence community have a good idea where many militia leaders are, two officials said, and have, in the past two weeks, considered the possible blowback if targeted airstrikes were to kill those leaders.
The effort to calibrate retaliation is inexact, the officials acknowledged. The strike against the weapons warehouse early Thursday was aimed at “disrupting and degrading” the abilities of the militias to carry out attacks against American troops, a senior Pentagon official told reporters after the strike.
But the strike was carried out late at night in Syria when the chances of hitting any Iranian personnel or militia fighters were small, Pentagon officials said.
The Biden administration also uses a “deconfliction” line with Russia to try to manage escalation in Iraq and Syria, two officials said. Russia has troops in Syria, and American officials say they expect that telling Russia before a strike in Syria, as officials did before the latest U.S. strike, is the same as telling Iran, because Russian officials often inform Tehran of what is coming.
Some congressional Republicans have criticized the administration for what they have said was a weak U.S. response to the steady stream of attacks by Iran-backed militias.
“Pin prick strikes against ammo dumps in the desert won’t do a damn thing to stop Iran from attacking our troops,” Representative Michael Waltz, a Florida Republican and former Army Green Beret, said in a post on X after the latest airstrikes.
The United States has been shifting military assets since Hamas’s surprise attack against Israel on Oct. 7 to try to prevent a regional war.
It has deployed one aircraft carrier to the eastern Mediterranean near Israel and another now in the Red Sea heading south, as well as dozens of additional warplanes to the Persian Gulf region. The Pentagon has also rushed additional Patriot antimissile batteries and other air defenses to several Gulf nations to protect U.S. troops and bases in the region.
Iran’s supreme leader, Ayatollah Ali Khamenei, has repeatedly pledged to destroy Israel and repel U.S. military forces from the region, and the leaders of militant groups in Yemen, Lebanon, Syria, Iraq and Gaza view Mr. Khamenei as a powerful ally, often seeking his advice and consulting with him on strategic issues.
Despite the often fiery rhetoric from Tehran, U.S. officials assess that Israel’s adversaries are not seeking a wider war.
“We assess Iran, Hezbollah and their linked proxies are trying to calibrate their activity, avoiding actions that would open up a concerted second front with the United States or Israel, while still exacting costs in the midst of the current conflict,” Christine S. Abizaid, the leader of the National Counterterrorism Center, told a Senate panel last week. “This is a very fine line to walk.”
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