"Connection has been lost with the crew of a Russian Il-20 plane over the Mediterranean Sea 35 kilometres from the Syrian coast as it was returning to the Hmeimim airbase", the Russian defence ministry said early Tuesday.
The official added that the plane was downed by a Russian-made missile system which was sold to Syria.
On Sept. 17, 2018, CNN, citing an unnamed US government official, reported that the USA military believed Syrian surface-to-air missiles had brought down the Il-20.
The fate of the 14 people on board the missing plane is unknown, and a rescue operation has been organised out of the Hmeymim base, the ministry said.
Russia's Defense Ministry has said that one of its military aircraft "disappeared" over the Mediterranean during an Israeli air attack on Syria.
The state-run Al-Ikhbariya TV reported loud explosions in the coastal Latakia province, saying they were likely from Israeli strikes targeting a state company for technical industries. An unidentified military official was quoted as saying Syrian air defenses intercepted some missiles heading for the provincial capital of Latakia from the sea.
Earlier, the official Syrian news agency SANA reported that missiles were fired at several locations in Latakia late on September 17.
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The source of the missiles was not immediately clear.
Israel is alleged to have been behind a series of airstrikes mainly targeting Iranian and Hezbollah forces in Syria that have joined the country's war fighting alongside the government.
Hotlines are in place for those countries to share operational information on their deployments, but diplomats and military planners say there is still a high risk of one state inadvertently striking another country's forces.
The Israel Defense Forces have not commented on the strikes, which appeared to involve F-16 fighters firing stand-off weapons, possibly from Lebanese airspace, into Latakia at a Syrian Organization for Technological Industries facility.
When asked for comment about Monday's attack, an Israeli military spokeswoman said Israel did not comment on foreign reports.
In recent weeks, Russian officials have repeatedly said that rebels in Idlib were preparing a chemical weapons attack that could be blamed on the Syrian Government and prompt a retaliatory strike by the West.