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In this case it looked like a frame but actually the content had been copied onto their own site.
This one was very much against adsense policies, but they aren't very good at dealing with things like this (no staff to police their system). A DMCA to the host might be more effective but takes more effort.
Their ad was rather descrete - not very large - in a bar on the top with google translate.
But technically I suppose it is not allowed to show adsense inside a frame sourronded by other ads.