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.