Here is newer information on the Black Sea spoofing incident. The latest GPS WORLD magazine edition (November 2017) mentions that an informed reader comments:
We have been following this case for quite some time now. We track all merchant vessels worldwide on the basis of Automatic
Identification System (AIS) 24/7.
The spoofing is still going on. Even today ships were placed at the airport runway. In total over 600 vessels were placed on the runway since early June. Our preliminary conclusion is that the 'spoofing' is probably NOT done on purpose. The most likely cause of this spoofing is a GPS re-radiator transmitter located in the hanger close to the end of the runway. This device is used for testing GPS when planes are placed inside the hanger. So, line-of-sight interference?