How did Y-haplogroup J2b get to Europe?

Y-haplogroup J2b, defined by the L282 mutation, is found throughout Europe and reaches relatively high frequencies in the southeastern part of the continent. But the question of how and when it got to Europe is still wide open.

It's certainly native to the Near East, where all of the main subclades of Y-haplogroup J2 show more structure than anywhere else. Indeed, it's first attested in the