Russian President Vladimir Putin risks losing hard-won gains in Syria after the U.S. upended the balance of forces by striking at his ally President Bashar al-Assad in response to an apparent chemical attack that killed scores of people.

While Russia is hoping the barrage of 59 Tomahawk cruise missiles launched at a Syrian airbase early Friday doesn’t signal further U.S. military involvement, it’s bracing for more confrontation as U.S. Secretary of State Rex Tillerson prepares for his first visit to Moscow next week…

The U.S. leader was forced into action after the anti-Russian establishment in Washington boxed him into a corner and Trump increasingly resembles his defeated Democratic opponent, Hillary Clinton, said Oleg Morozov, a former top Kremlin official who’s now a member of the upper house of parliament’s international affairs committee. “The conflict in Syria, which was heading to a peaceful resolution, is now flaring up again,” he said.

The U.S. airstrikes may be a “one-off” that Trump doesn’t intend to repeat, said Kortunov, the head of the Kremlin-linked research group.