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Yeah, I think so too, it's probably illegal in every country.
But in Croatia, it's not only threatening to kill a major politician against the law, it's threatening to kill anyone (no matter who that person is or does it work like genitor or it's a president of the country). And it's not only the law it's one of the main constitutional rights, saying: "Every human being has the right to life." Accordingly, there is no death penalty, as well.

It's illegal to threaten anyone's life or any other threats of violence in America too... I actually talk about it in this post. However, it's illegal to even joke about killing the president here.