A reconnaissance aircraft for the US Air Force has reportedly flown over the Syrian borders in order to collect information on the recently-delivered S-300 missile system , sources specialized in aviation confirmed.
According to the same sources, a reconnaissance aircraft type RC-135 took off from a military airbase in Crete Island, Greece and flew for a few hours over the Syrian coast.
During this time, a Russian IL-76 plane took off from the Russian base of Hmeimim.
Earlier, a RC-135W reconnaissance plane for the RAF was spotted flying over southern Syria through Iraqi, Jordanian and Israeli airspace.
A Turkish drone was also seen hovering over the jihadi-held province of Idlib in northwestern Syria.
This comes after Russian has delivered the advanced S-300 missile system to Syria last month.
On a related context, USA is preparing its F-35 Lightning II multirole fighters to confront the S-300 missiles in Syria.
Earlier, Russia announced that it would provide Syria with the S-300 missile defense system as part of its response to the downing of a Russian Il-20 plane with 15 airmen onboard in Latakia.
On 2 Oct. ,The S-300 missile system and dozens of additional hardware pieces have been delivered to the Syrian military to boost security of Russian personnel there .