I don't think is that... the EU happily come to "rescue" Uyghurs from Beijing, or Kosovars from Belgrade, or Chechens from Moscow... the pattern I find is always to support Washington DC. For sure, you have much more chances of success by standing with the US (till now at least), but tens and tens of countries... that is not a normal statistical curve! And Corbin's expulsion doubt US had anything to do with it.
One thing you said lighted my mind though, countries that committed genocide are very into Israel today though... well, no Belgium though... it is complicated I guess, not a normal curve though.
You really don't know how researches work... they get to be in multiple projects globally, specially when working in a university... that is why of the name. Besides, the US is highly sensitive with confidential information and for the most ridiculous things you need a "security clearance" that he will never get even the most basic one. Today, most on the spying is not done presentially within the target country, let alone with such a prominent position.