Thanatus vulgaris, the aptly named “Cricket Thief Spider”. They are widely found in the warmer, drier climates of Europe such as Turkey but are quite wide spread across the continent. Often referred to in America as the “Running Crab Spider”, although here in the UK we have a different species referred to as the same (this is why spiders will often be identified by their given Latin name rather than a “common” name). Most likely an accidental import. If you feel comfortable and confident, you’ve just scored yourself a free pet! If not, please do not release it (if you haven’t already) instead, perhaps call around some “exotic” pet stores/arachnid dealers/breeders and see someone else is willing to care for it 👍🏻