In a number of places in Europe (I can't say how many, I've only researched the one I moved to, and know that some others are similar), you need to reside there

In a number of places in Europe (I can't say how many, I've only researched the one I moved to, and know that some others are similar), you need to reside there lawfully for a number of years, in my case five, pass some basic tests of language and culture, and then you can apply for citizenship. That's really about all that's required. It's actually an almost identical process to becoming a permanent resident, which is what I'm aiming for due to no-dual-citizenship requirements.