GREATEST WAR EVER:

Russia's force in Syria has suffered losses since late January more than three times higher than the official toll, according to evidence gathered by Reuters, a tally that shows the fight in Syria is tougher and more costly than the Kremlin has disclosed.

Eighteen Russian citizens fighting alongside Moscow's allies, the Syrian government forces, have been killed since Jan. 29 -- a period that coincided with intense fighting to recapture the city of Palmyra from the Islamic State group.

The Russian defense ministry has publicly reported only five servicemen's deaths in Syria over the same period, and its officials' statements have not mentioned any large-scale Russian ground operations in the fight for Palmyra.

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