I have previously posted about how the prospect of EU membership was an important factor in the success of the secession movements in the different republics in fromer Yugoslavia. Today an article from the United Kingdom about nationalism there.
In 1999 London gave Scotland and Wales a great deal of autonomy, believing that that would stop nationalism there. It hasn't. Nationalism is as high as ever. And what is new: the English are getting nationalist too. 51% of the Scottish favor independence now, but from the English 59% favor Scottish independence.
One more illustration that "feeding the beast" is not the solution to solve nationalism. It only makes it stronger. Instead one should primarily work on a central state where everyone feels equal. And if one carefully listens the supporters of the nationalist parties have some specific demands (like keeping more money in the province) that can be solved. More power for the regional parliament usually doesn't bother them: it is more a hobby of the nationalist politicians themselves, not their supporters.