J2b2-L283 is only found among Europeans so far, Ancient and Modern, so it has its core here.
No. You can see J-Z597* is found in Lebanon (LBN, LB-JL, Mount Lebanon).
About origin J2b2 M241, probably it is Southern Anatolia/Northern Near East. From that area, probably via Caucasus, its carriers arrived to Russia, and after that to the Carpathians and Balkans. Although there are authors who claim another path to Balkans via Anatolia and Bosphorus.