I'll assume he's long gone now, but if it happens again,
take your digital, take lots of photos, get recorded statements, names, contact details of witnesses,
go straight to the port captain.
The Turks have a huge investment in yacht tourism, and are a rightfully proud people. I suspect the Port authorities will not look kindly on someone causing mayhem in their waters, and if you can ever get a lawyer to threaten anyone with the fact of being a lawyer...1. he's not much of a lawyer to start with, and 2. he's got a real uphill job trying to convince someone he's innocent.
If you are insured, call your insurer and get them copies of everything you have including CLEAR, CONCISE, WRITTEN, SIGNED statements of exactly what you and any witness saw heard etc. Request the Port Captain to demand proof of insurance from the other guy (a lot of countries require it, even if they don't, few would refuse to show the Port Captain upon request.) Anyway, send all that stuff to your insurer along with estimates of repair, not just one, get two or three. Its entirely possible that they may contact his insurer and prosecute the claim. This last you could still do. Nothing prevents you or your insurer from making a demand directly to HIS insurer...
Oh, and the Israeli's *generally* keep a close eye on who owns what boat and last I knew, THEY required insurance.
Very few yacht insurance companies of note are stictly single national, so unlikely they would just try to stonewall you behind Israel's borders.