In recent weeks, thousands have protested against Putin’s dictatorial regime following the jailing of a new opposition leader, Alexey Navalny.
The whereabouts of Navalny, 44, had been a mystery since he left jail in Moscow.
The United States on Tuesday imposed sanctions to punish Russia for what it described as Moscow's attempt to poison opposition politician Alexei Navalny with a nerve agent last year.
The officials said Navalny was targeted for his activism in trying to raise questions about what they called Russian corruption.
Many Western countries say Navalny was poisoned with a nerve agent, but the Kremlin has denied any role in his illness and has said it has seen no proof that he was poisoned.
The helicopter was not fired at, the report added.
Russian forces have been digging for more than three weeks in the cemetery at the Yarmouk refugee camp.
Results of the trial are expected to be published soon, but this was the first indication of how the tests are going.
Hassan Ghabash's comments, carried by state news agency SANA, did not specify which country provided the vaccines or how many doses had arrived.
Amnesty still believes that Navalny should be freed from jail.