Russia's lower house of parliament on Friday ratified an agreement presented by President Vladimir Putin to indefinitely station combat aircraft and soldiers in Syria.
The deal will bring Syria closer to peace, the legislature's deputy speaker, Sergei Zheleznyak, said in comments carried by state news agency TASS.
The deal was created last year by Moscow and Damascus and stipulates impunity for Russian servicemen and the ability to freely transport weaponry and munitions in Syria.
Russia is a major ally of embattled Syrian President Bashar al-Assad and has been bombing militant groups in the war-torn country for more than a year.
Russia has two military bases in coastal Syria, the Khmeimim airbase in the province of Latakia and a naval facility in the port city of Tartus.