[Cthulhu_]

For a lot of people it's easier to learn English than Chinese - you wouldn't get far if you don't speak the language in China. English gets you very far in Europe though, most research institutions, universities, high end professions, etc already have English as the going language because of the international character of these places.

[em500]

I think you're missing my point. China does not need to or aim to attract any researcher from anywhere. Just attracting top tier ethnic Chinese researchers and technical talent from the US is already a big unequivocal win for them. That talent pool is big: any US Math/Physics Olympiad team of the past 10-20 years is >2/3rds ethnically Chinese. And for them, Europe is not necessarily a more attractive destination than China.