I don’t see how that makes sense in practice in a globalised world with the internet. The information is going to come from everywhere, and given the way the US meddles, our elections are of interest to practically every country. OF COURSE they’re going to try to influence our elections. Even a brief glance at our own history shows us doing that to, uh, practically every other country. It’s only going to get more pronounced! I see no practical way of achieving what you want other than burying our heads in the sand.