> the northern League wanting to break off from Italy and form another country
This isn't the 90's, that stuff died down when we all united against the africans. [1] There's no separatist movement in Italy other than in fringe groups on Facebook. Definitely much less than "Texas wanting to secede" anyway.
Supporting Taiwan is really not a question of opposing local separatist movements (at least in Italy) as much as just "losing China" and all that it'd entail.
[1]: https://www.youtube.com/watch?v=M2KTI_mZ0v4
This video is satire, racist POV