At the present time, Turkey cryptocurrency regulation is nonexistent. Lawmakers have not seen fit to restrict or regulate the trading of these digital currencies within the nation. In fact, it seems they may be interested in issuing their own digital currency even. They've drafted paperwork for what they call "Turkcoin", and if it goes ahead then they would be one of the first country's to have an official cryptocurrency.
This coin would tokenize asset-backed securities, which they claim will offer investors reduced risk when compared to traditional cryptocurrencies like BTC or ETH. These assets would include stock in Turkish companies.
While there has been some discussion on increasing regulations on Bitcoin and other cryptocurrencies within the country to reduce or eliminate the ability for Bitcoin to be used for crime, so far there are no details on this concept. While the climate for cryptocurrencies is currently favorable, investors should be wary.
It's entirely possible that a country with its own cryptocurrency could try to ban its citizens from using any outside coins or tokens which they do not control. However, at the present time that seems unlikely, and the nation's officials seem more interested in generating tax revenues from Bitcoin than banning it. This trend is likely to continue into the near future, and investors can likely expect good things here.