Russia has used the air base in Hmeimim and the naval base in Tartus to support Bashar al-Assad in Syria's 13-year civil war. However, the current Assad government has collapsed.
According to the Washington Post, the images show Russia dismantling equipment at an air base in Syria and putting it on cargo aircraft after President Bashar al-Assad was overthrown.
Satellite images taken by trading company Maxar on the morning of December 13 showed two An-124 cargo aircraft at Russia's Hmeimim airport opening the door to receive the equipment.
A Ka-52 attack helicopter and an S-400 air defense complex are being dismantled nearby. It is likely that these weapons will be transported by cargo plane, Maxar said.
Russia has used an air base 25 km south of Latakia to support Mr Assad in Syria's 13-year civil war. Mr Assad left Syria this week as opposition forces took control of Damascus.
Russia has also used Hmeimim to deploy power across the Middle East and Africa. Russia signed a 49-year lease on the facility in 2017.
The Russian naval base at Tartus, built during the Soviet era, supports ships in the eastern Mediterranean.
Analysts said that with the large amount of Russian equipment in Syria, the entire withdrawal will take time.
"It is clear that the withdrawal is underway," said Dara Massicot, a senior fellow at the Carnegie Endowment for International Peace. But it is unclear whether Russia will withdraw completely or partially.
The Islamist group Hayat Tahrir al-Sham took over Syria when Mr. Assad's government collapsed. Moscow said it is negotiating with Hayat Tahrir al-Sham and has no plans to leave Syria.
Russian Deputy Foreign Minister Mikhail Bogdanov told reporters on December 12 that: "The bases are still on Syrian territory as before. No other decisions have been made.
However, the Washington Post points out that Russia has reorganized many of its assets in Syria. The ship left the Tartus naval base 10 days ago to operate offshore. The Russian military also left smaller bases in Manbij and Kobane earlier this week.
