The withdrawal comes as rebels advancing from Damascus push toward Syria's coastal provinces, including Latakia, Hama and Tartus, where Russian military bases are located, Ukraine's military intelligence agency said.
Also, the only orher warm water port they have is in Kaliningrad, which is separated off mainland Russia by the Suwalki gap (and Belarus but they are already almost russia so,...) so a massive blow to lose the port in Syria IMO.