As President Donald Trump warned on Twitter that U.S. missiles “will be coming” in the wake of a suspected chemical attack in the town of Douma, Syria, Russian officials warned that any military action by the U.S. and its allies would be met with an aggressive response—targeting any U.S. missiles as well as their launch sites.

“If there is a strike by the Americans, then we refer to the statements of President Putin and the chief of staff that the missiles will be downed and even the sources from which the missiles were fired,” Alexander Zasypkin, Russia’s ambassador to Lebanon, said Wednesday.

Though international investigators have not completed an investigation into the suspected poison gas attack that reportedly killed more than 45 people on Saturday, Trump swiftly placed the blame on Syrian President Bashar al-Assad, joining leaders from countries including the U.K. and France who have called for “strong” action against Syria.

Zasypkin’s comments came two days after the U.S.S. Donald Cook, a Navy destroyer, left a port in Cyprus, carrying Tomahawk cruise missiles—the same missiles Trump launched into Syria last April after another chemical attack.

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