MOSCOW — Russia said Monday it was sending two airplanes from its emergency services fleet to Beirut to evacuate about 100 Russian citizens from Syria, reflecting Moscow’s assessment that President Bashar Assad’s forces are losing control of the country after nearly two years of fighting.

It was not clear whether the news signaled the beginning of a large-scale evacuation. Russia has an estimated 30,000 citizens in Syria, including government and military personnel, private contractors, and tens of thousands of women married to Syrian men.