The Pentagon has denied responsibility for the attack.
Syria has been ravaged by a bloody civil war for the past seven years.
Syrian Observatory for Human Rights says warplanes carried out air strikes on rebel-held areas in the eastern Homs countryside.
Moscow had its S-400 missile system in range of the strike.
The group claimed responsibility for explosions that killed dozens of people in Homs.
The head of military security was among the dead after attacks at two Syrian security offices
Syrian minister attacks "Western" countries for accusing it of atrocities in five-year conflict.
The journalist's family is suing the regime of Bashar al-Assad over accusations it assassinated her.
Jaish al-Islam says it's still coming under attack from government forces.
Syrian President Bashar al-Assad has meanwhile told refugees to come home.
A series of four blasts hit the hospital within an hour, a tactic often used by the Syrian Air Force
The offensive builds on over a week of ground attacks launched with Russian air support.
Senior U.S. lawmakers have begun probing possible intelligence lapses over Moscow's intervention in Syria.
The strikes seemed to have been carried out near Homs, an area crucial to Assad's control of western Syria.
"The city is now totally controlled by gunmen and its destiny is dark and dim."