Censor.NET reports citing Gazeta.ru
Ukraine and Poland agreed upon roadmap of dialogue between the leaders
"We are aware of reports that Russia may have deployed military personnel and aircraft to Syria, and we are monitoring those reports quite closely," Earnest said.
According to him, any military support to the Assad regime for any purpose, whether it's in the form of military personnel, aircraft supplies, weapons, or funding, is both destabilizing and counterproductive.
Russia supports Assad's army at war against Syrian rebels. PHOTOS+VIDEO
The comments come after images appeared on a social media account linked to Syrian fighters purporting to show Russian aircraft and drones near Idlib province. Unconfirmed reports suggested the aircraft may have included a Russian Sukhoi 34 advanced strike fighter, which Syria is not thought to own.
A US official confirmed that Russia has asked for clearances for military flight to Syria, but added "we don't know what their goals are."
The White House said, however, that it would welcome Russia's involvement in the international coalition established to counter Islamic State and in diplomatic efforts to end the brutal civil war.