What a strange article. Is there a translation or cultural context? The part about the Japanese "los[ing] face" or the reference to Russian civic culture are two of many puzzling bits.
The slogan means "no special rights for foreigners", in protest of a practice that allows foreign residents in switzerland to sign petitions to open up a non-binding resolution in local city councils.
I don't think I've seen such baldly racist imagery from a US political party in my lifetime - it looks like WW2 propoganda.
As an American (who has also spent a lot of time in Switzerland) I agree that it's shocking. But, I think it's also a little understandable. There is a strong desire to preserve swiss culture. Switzerland is a country with a history and culture stretching back into antiquity. In the US, we are a country of immigrants.