Interfax reported that another landing ship had left the Black Sea port of Sevastopol on Friday morning and was to pick up a "special cargo" in Novorossiysk before sailing toward the eastern Mediterranean. The state RIA Novosti news agency also said that the landing ship Nikolai Filchenkov would be headed toward Syria after picking up cargo in Novorossiysk, which it said would take several days.
The three ships reported to have passed through the Dardanelles are the Novocherkassk and Minsk landing vessels and Priazovye reconnaissance ship.
The Defense Ministry said it was unable immediately to confirm the ships' departure.
The Foreign Ministry issued a statement Friday, warning the U.S. and its allies against striking any chemical weapons storage facilities in Syria.
"That would create the threat of releasing highly toxic chemical agents, with corresponding consequences for the civilian population and the environment," the statement said. "Moreover, it can't be excluded that as a result of such a reckless action militants or terrorists could gain access to chemical weapons. This is a step toward proliferation of chemical weapons not only across Syrian territory but beyond its borders."