Russia said on Tuesday that a U.S. decision to ease restrictions on arming Syrian rebels had opened the way for deliveries of shoulder-fired anti-aircraft missiles, a move it said would directly threaten Russian forces in Syria.

Moscow last year launched a campaign of air strikes in Syria to help President Bashar al-Assad and his forces retake territory lost to rebels, some of whom are supported by the United States.

Foreign Ministry spokeswoman Maria Zakharova said the policy change easing restrictions on weapons supplies had been set out in a new U.S. defense spending bill and that Moscow regarded the step as a hostile act.

U.S. President Barack Obama, who has been sharply critical of Russia’s intervention in Syria, signed the annual defense policy bill into law last week.

State Department spokesman Mark Toner dismissed the Russian charges, saying the administration remains opposed to providing portable anti-aircraft missiles, or MANPADS, to Syrian opposition groups.

“Our position on MANPADS has not changed. We have a very deep concern about that kind of weaponry getting into Syria,” Toner said, referring to fears that portable anti-aircraft missiles could end up in the hands of Islamist militants and be used against civilian airliners.

Russia accuses US of committing hostile act for easing restrictions on arming rebels

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