@DerekMoors How I understand it (also not a lawyer), is there can't be tampering if there isn't a trial. They would have to actually charge him with a crime first, then he would need to put pressure on Kim to recant, fail to answer or change her testimony. That's when it becomes tampering and not before the criminal is charged with the crime. What you're saying is criminal coercion. Not sure if Croatia has a law on this.
Interestingly enough I've always wondered if an AG in the US could launch a case against WTBS charging them with criminal coercion on the state level for covering up child sex abuse. It would be pretty easy to get a jury to dislike WTBS. If they showed up and seized documents and servers it would probably be a treasure trove for investigators.