More responses here, here, here and here. Also check out Viktor's response.
DS: Isn't our boy well mannered?
DSS: President of the Republic, who's that?
Center politicians in Croatia: That was sweet.
Right politicians in Croatia: Maybe, but he's still from Serbia, isn't he?
Serbian NGOs: He's starting to get good at this.
LDP: More, more.
SRS: If that stuff was so bad, why were we so well compensated for it?
SPS: If only we had known about this guy earlier.