There is a palpable sense in the region that the tide has turned against Islamic State.
The offensive appears to be the biggest Damascus has mounted against Islamic State since it recaptured the city of Palmyra
Tabqa would be a difficult military target because Islamic State has large stocks of weapons there.
Russia has said it will keep bombing Islamic State and the al Qaeda-linked Nusra Front
Washington's strategy in Syria has shifted this year to supplying groups headed by U.S.-vetted commanders.
The military said that the latest strikes had destroyed 80 tanker trucks near the Islamic State stronghold of Raqa
The operation struck a command center, recruitment center for jihadists, a munitions depot and a training camp for fighters
Some 1,500 Syrians wait at the border to cross into Turkey as Syrian Kurds push deeper into Islamic State...