Baladi News
A rotation of the Russian Project 636.3 'Kilo'-class submarines stationed in Syria was seemingly confirmed when one was spotted making its way north through the Bosphorus to the Black Sea on 27 March.
The submarine was identified by Turkish ship spotters as Veliky Novgorod , one of two Kilos that have been operating out of Tartus since September 2017.
This followed a south-bound Bosphorus transit of a Project 636.6 identified as Krasnodar on 14 March.
Earlier in March the commander of the 4th Independent Submarine Brigade stated in the Black Sea Fleet's newspaper that both Krasnodar and Stary Oskol were preparing for long deployments.
Source: Jane's Intelligence.