Isn't this exactly the right use case for an NDA? Making sure everyone understands what's secret and what isn't?
Much like everyone making a purchase online will 'agree to the terms and conditions' without reading them, many jobs get so many NDAs thrust at them that they'll sign without reading them.
If you repair office coffee machines for a living? You might visit 4 office buildings a day, and they'll all hand you a pile of paperwork telling you not to take photos, not to connect things to their computers, that you should evacuate if you hear the fire alarm, and so on. Hardly anybody reads such things before signing them.
If you're actually signing, with signature, a legal document without reading it, you reap what you sow. Ticking a checkbox on a site is not the same legally binding agreement that an NDA is.
Courts might as well make decisions based on income. Income and working conditions already filter out a lot of theoretical rights for the working poor before even getting a court date. And come to think of it, there are all sorts of examples where the income of plaintiffs or defendants even matter expressis verbis...
It’s not? I thought it was! (Not that it should be.)
Sites that use "By using this service, you agree to X." do not hold up in court almost at all.
Sites that use "By checking this box, you agree to X." there is some semblance of a binding agreement but there's a lot of wiggle-room in court. User doesn't understand, wasn't made clear, wasn't actually the user, etc. can all be argued.
Sites where you sign your name in some way, shape or form, tend to be treated more fortified - a la Docusign, which employs an extensive set of protections against forgery and cases of misunderstanding. These cases probably couldn't be argued in court on the premise of sort of 'unintentional' agreement like the prior two could be.
This of course extends to written documents.
Unless you're signing NDAs with a checkbox (which would be kind of reckless on the issuer's part), then NDAs hold much more weight in court in most cases as there is very little ambiguity as to whether or not the signee actually meant to sign it.
For some foreign journalist or diplomat sure but against a local journalist, maintenance crew, cleaner, etc who all most likely sign the exact same NDA for sure Ukraine can enforce it if the person is unable to escape the country (which for males aged 18 to 65 is really hard at the moment for example)
edit: Also as a journalist if you actually do leak such information after signing a piece of paper saying you would not who would actually trust you with any kind of secret information in the future?