I'm sure that there are plenty of crimes these folks could be arrested for, and then subjected to the normal legal process. Kidnapping and intimidation are criminal offenses, at least where I live

intimidation and black mail sound like perfectly good reasons to arrest these people in most countries

What makes you think this doesn't happen if there is good evidence of wrongdoing? In democracies, we don't just randomly arrest people, we need actual evidence that holds up in court.

>>In democracies, we don't just randomly arrest people,

There are tons of proof and examples of this being false. Lots of example of police targeting people then finding the law they broke, instead of starting with a crime and finding who did it

And this is a good thing that we should do more of?

To be fair, non-immigrant visas can often be revoked on a discretionary basis.

>There’s no such thing as foreign secret police.

The US secret service has offices in over a dozen countries, including China.

That's different. We're the good guys.

The NYPD is also in singapore

Unlikely to happen unfortunately. I mean Russia performed assassinations on UK soil and everyone knows it. Nothing really seemed to happen from that.

Do you understand that China will arrest some American citizens afterwards and will trade them for those "spies"?

Some western people are completely out of bounds. You're basically suggesting trading humans. It's called slavery. To arrest someone and trade him for someone. What's going on. You're not the only person suggesting it. I saw similar comments on other websites. For example someone suggested to arrest some random Russian sportsman and trade him for American sportsman girl who was arrested because of marihuana found on her in airport.

It's just wrong. It creates all the kinds of wrong incentives. If you think that someone is a spy and you can prove it, go ahead and put him in jail or deport him or apply whatever measures law requires. But no human trading.

Prisoners of War are not the same as slaves. Words have meaning.

You really count on semantics to keep us safe from tyranny?

Not parent's point. The point was not to conflate Prisoners of War (or Prisoners of Spy War here?) with slaves. Slaves are enslaved to provide labor without rights and payments, are treated as commodity, and are traded for other commodities, with explicit monetary value. In the case of spy prisoners, people who are in jail because they broke some law are traded for other people in jail in another country who broke another law, because they are valuable to their country of origin, and they too want to return to their home country instead of being in jail in a foreign country. They are not used for labor and they do not have monetary value that can be used in a market.

China is not at war with US.

I would not be so sure...

Yet.