A logistics point in the city of Tartus has existed since 1971, and is located in the northern part of the local port and occupies about 20% of its area. It was created for the repair, supply of fuel and consumables of ships of the Mediterranean squadron of the Soviet Navy. The Tartu PMTO never grew to a full-fledged naval base. In fact, it was a series of basic sites.
Since 2015, Tartus has been serving the supply of the Russian group in Syria.
The strategic importance of Tartus for Russia is difficult to overestimate. And not only in the context of the Syrian operation. From here you can control the movement of two US fleets at once.