OSINT - 4 Russian Navy Improved-KILO Class Submarines In Tartus, Syria
 There are currently 5 Russian Navy Pr.636.3 Improved KILO Class submarines in the Mediterranean. Analysis of Open sources confirms that four of them are in Tartus, Syria. 
September-17 imagery from a Sentinel-2 satellite shows the four boats. Submarines  can be extremely different to see on low-resolution satellite imagery. However there is confidence in this ID. Two of the submarines are in the usual place, and two directly opposite. Several Russian warships and support ships are also present. 

File image of Improved-KILO  Stary-Oskol (B-262) in Tartus, July 2019. Russian MoD photo
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