It happens all over college basketball every year.
Also when Sanogo committed he said he didn't want to spend 4 years in college. I'm sure someone knows which article I'm talking about.
Can you name some examples of non-European players leaving college early to play in Europe? I'm just not aware of any, so I am curious. Outlier situations, like a player flunking out of school, don't count.
I recall the same thing about Sanogo wanting to go pro early. I don't remember the exact words used, but my interpretation was that he was referring to the NBA. Of course, if players leave early for foreign leagues all the time, like you are implying, it could be that my ignorance of that fact caused me to falsely assume he was referring exclusively to the NBA.