The US tries to charge foreigners of crimes all of the time.

Here's a slightly biased summary, but in this case I think the extreme outrage and bias is totally justified.

https://prospect.org/justice/julian-assange-espionage-act-19...

No. Until the recent convictions in relation to January 6th, the most recent US conviction for sedition was against an Egyptian for his role in the 1993 World Trade Center bombing. He died in federal prison.