WASHINGTON — President Donald Trump on Saturday declared “Mission Accomplished” for a U.S.-led allied missile attack on Syria’s chemical weapons program, but the Pentagon said the pummeling of three chemical-related facilities left enough others intact to enable the Assad government to use banned weapons against civilians if it chooses.

“A perfectly executed strike,” Trump tweeted after U.S., French and British warplanes and ships launched more than 100 missiles nearly unopposed by Syrian air defenses. “Could not have had a better result. Mission Accomplished!”

His choice of words recalled a similar claim associated with President George W. Bush following the U.S.-led invasion of Iraq. Bush addressed sailors aboard a Navy ship in May 2003 alongside a “Mission Accomplished” banner, just weeks before it became apparent that Iraqis had organized an insurgency that tied down U.S. forces for years.

The nighttime Syria assault was carefully limited to minimize civilian casualties and avoid direct conflict with Syria’s key ally, Russia, but confusion arose over the extent to which Washington warned Moscow in advance. The Pentagon said it gave no explicit warning.

The U.S. ambassador in Moscow, John Huntsman, said in a video, “Before we took action, the United States communicated with” Russia to “reduce the danger of any Russian or civilian casualties.”

Dana W. White, the chief Pentagon spokeswoman, said that to her knowledge no one in the Defense Department communicated with Moscow in advance, other than the acknowledged use of a military-to-military hotline that has routinely helped minimize the risk of U.S.-Russian collisions or confrontations in Syrian airspace. Officials said this did not include giving Russian advance notice of where or when allied airstrikes would happen.

Russia has military forces, including air defenses, in several areas of Syria to support President Bashar Assad in his long war against anti-government rebels.

Russia and Iran called the use of force by the United States and its allies a “military crime” and “act of aggression.” The U.N. Security Council met to debate the strikes, but rejected a Russian resolution calling for condemnation of the “aggression” by the three Western allies.

Trump’s U.N. ambassador, Nikki Haley, told the session that the president has made it clear that if Assad uses poison gas again, “the United States is locked and loaded.”

Assad denies he has used chemical weapons, and the Trump administration has yet to present hard evidence of what it says precipitated the allied missiles attack: a chlorine gas attack on civilians in Douma on April 7.