COMPARE: Which European countries have the strictest rules on dual citizenship?

Being a citizen of your country of long-term residence brings a lot of advantages, especially when it comes to peace of mind, but some countries in Europe have far stricter rules than others.

COMPARE: Which European countries have the strictest rules on dual citizenship?
Being a citizen of your country of long-term residence brings a lot of advantages, especially when it comes to peace of mind, but some countries in Europe have far stricter rules than others.