Greece and Turkey are both NATO, but they never gotten along very well. Apparently, they have been playing bumper boats and this 12 February 2018 incident is not the first time. The Turkish cutter is larger. We looked at her class earlier. The Greek vessel was a Damen Stan Patrol 5509 (55 meters long and 9 metes of beam) offshore patrol vessel, which reportedly suffered significant damage to her hull. Here is a page that provides info on both classes,
As I said the Greeks and Turks have been going at each other for a while. The intentional collision below reportedly happened on January 17, 2018.
The video below was posted to YouTube May 8, 2016.
This incident occurred 24 Jan. 2014
Thanks to Luke for bringing this to my attention.