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Russian girl second passport with Shengen

Do you really need a passport? Can't you just get residency, which would give you travel rights to Schengen countries?
And anyway, all countries should allow you to naturalize after a certain number of years.
Aren't there digital nomad or entrepreneur visas in a number of EU countries?
 
As I mentioned, many of my friends have chosen this path. I'm not a lawyer, so if you have any doubts, you should contact one. The main idea is that you're receiving income from abroad and not working in Spain, it was designed for retirees.
Your friends are paying taxes to Spain? How much?
How much time do they spend there?
How many times they renewed their NLV?