Bxdty

This might be my perception being biased from what media is reporting about.

But how I see it, here in Germany it is usually reported in media like:

"Spy [Name] was convicted of having transfered [SensibleData] to [SecretService] of [State]. This means [Impact]. He will now face [JuristicalMeasures]"

But while I understand that such activity can't be kept unpunished, as otherwise you had nothing to loose if you just hoarded any sensible data you ever had access to.... just for the case. I still don't understand why the focus is on punishing the spy, rather than the contractor. I mean the spy acts either cause he has gains from it, or even worse, someone holds information to blackmail him into making use of his access to specific data. So by punishing him for doing it, you got rid of a single person that was willing to execute this activity, but it is safe to assume that the contractor has still the same amount of interest in getting access to sensible data and will most likely try to find another channel to obtain such data. And by rarely, if at all reacting political on these attempts, as long they are not getting revealed en mass, I can't see how taking measures against individuals has any real impact at all, considering that not rarely it are states financing the acquisition of such data, and with such resources, they probably will always be able to find others be willing to do that job, given the right pressure/payment. So I don't understand the rational behind this.

So my question is:
Is espionage internationally tolerated or, if not, what are political measures being taken to prevent or at least protect against it?

There are three levels to state "espionage":

1: Open data gathering. Embassy staff (possibly including local employees) buy newspapers and maps, visit companies and trade shows, and generally talk to people openly. This is perfectly legal in most places, although in some states the line between "public" and "secret" is a lot fuzzier; e.g. trying to get an accurate inflation figure by monitoring prices might be considered economic espionage if the government doesn't want the real number known.

2: Covert data gathering by accredited diplomats. People with diplomatic immunity cannot be arrested even if they break the law. So if, for instance, if a diplomat plants a bug when visiting a factory in order to spy on boardroom discussions, that is illegal, but the only thing the host nation can do is eject the diplomat. Everybody does stuff like this, and its not really worth ejecting the "guilty" diplomat because then you will just have to monitor his successor. So this is "tolerated" in the sense that nobody bothers trying to punish the guilty party; they just make it as hard as possible to get any information.

3: Covert data gathering and influencing of local affairs via local covert agents. These are the people who get arrested and thrown in prison for decades. The people who were paying them are accredited diplomats: see (2) above.

Everybody respects diplomatic immunity because otherwise nobody would risk sending their diplomats to you: while it is widely abused, allowing the local police to arrest a diplomat puts them at great risk of being held hostage by an unfriendly host state under false charges. Also if a diplomat commits a serious crime outside of their duties then their government may decide to waive diplomatic immunity, allowing the criminal to be arrested.