President Vladimir Putin on Monday ordered the bulk of the Russian military contingent in Syria to be pulled out after five months of air strikes, saying the Kremlin had achieved most of its objectives.
The precise number of planes Russia kept at its Hmeymim base in Syria's Latakia province is secret. But analysis of satellite imagery, air strikes and defense ministry statements suggested it had about 36 fixed-wing military jets there.
Reuters could not independently verify the movements of the aircraft and it was impossible to determine whether other aircraft were flying into Syria to replace those that left.
Military analysts say the departing Su-24 and Su-25 planes, aging Soviet-era planes that have undergone some modernisation, have been the workhorses of Russia's Syria campaign.
They carried out 75-80 percent of the more than 9,000 sorties flown by Russian pilots, said Maksim Shepovalenko, a former Russian military officer who is now deputy director of the Moscow-based Centre for Analysis of Strategies and Technologies (CAST).
