What would NATO do about it?
I doubt they or the rest of the NATO alliance would countenance a Russian base on a NATO member's soil
There is no strategic sense at all to that for anyone
NATO membership is looking pretty useful to Turkey about now, given the deterioration of Syria and Iran's future ICBMs
Now, a deal between Cyprus and Russia for the sale ...... err, “development” .... of Cyprus’ supposed offshore natural gas fields - is potential Russian domination of the Central Med by another means