Russian forces have started leaving Syria after Monday’s surprise withdrawal announcement by President Vladimir Putin.
Russian defence ministry says the first group of aircraft taking off from Hmeimim air base in Syria today, Tuesday and later in flight.
Officials say Russia will continue air strikes and keep several hundred personnel and air defence systems.
Peace talks aimed at resolving the conflict are entering a second day.
UN Special Envoy, Staffan de Mistura, who is mediating in the talks, welcomed the Russian decision.
“The announcement by President Putin on the very day of the beginning of this round of Intra-Syrian Talks in Geneva is a significant development, which we hope will have a positive impact on the progress of the negotiations,” he said.
The Russian force reduction was announced during a meeting between Putin, his defence and foreign ministers.
Russia is a key ally of Syrian President Bashar al-Assad and his office sought to reject speculation there was a rift between the two countries, saying the move was mutually agreed.
The Russian air campaign started last September, tipping the balance in favour of the Syrian government and allowing it to recapture territory from rebels, but on Tuesday the defence ministry announced the withdrawal.
It said in a statement that, “The first group of Russian planes has flown out of the Hmeimim air base for their permanent bases on the territory of the Russian Federation.
Aircraft from the base would make the flight to Russia, more than 5,000 kilometres; in small groups each led by Il-76 or Tu-154 transport planes.”
It added that, “They would then go their separate ways to their own bases after crossing the Russian border.
Su-24 tactical bombers, Su-25 attack fighters, Su-34 strike fighters and helicopters were returning home.”
Putin, however, said Hmeimim and Russia’s Mediterranean naval base at Tartous would continue to operate as normal.
Russian Deputy Defence Minister, Nikolay Pankov said some air strikes would continue.
“Certain positive results have been achieved… However, it is too early to talk about victory over terrorism. A Russian air group has the task of continuing to strike terrorist facilities,” he said.