It follows the "from" meaning of "z" so it's the plural genitive form, krajów, just like biednych
Is the word order for "międzynarodowa fundacja" important here? Can fundacjz come first?
"Fundacja międzynarodowa pomaga dzieciom z biednych krajów" was rejected. Is the word order important here? Thanks.
I don't think that we'd treat "international" as a category, and only this would make it work after the noun.