For signalling you need the signal. You need to break the train track and then say if you keep supporting Ukraine we'll do worse things. If you stay quiet, it doesn't work.
For the record, it was me. I committed terrorism to bring awareness to Rust's excessive use of punctuation marks.
No, (apparent) ambiguity works fine, as long as the recipient of the message understands it. The Mafia can put a brick through your window, and you know what's going on, even without them signing the brick.
Only if you recently did something that you know the Mafia hates. If I got a brick through my window right now, my best theory would be that they got the wrong window. What would yours be?
For the record, it was me. I committed terrorism to bring awareness to Rust's excessive use of punctuation marks.