According to recent report by Ukrainian Security Service (see article in Russian):
- Somebody sent assaulting and threatening e-mails to the President of Ukraine;
- Ukrainian Security Service cooperating with FBI defined his personality and whereabouts: this was Ukrainian national staying in Miami;
- They are now working to extradite him to Ukraine;
- Ukrainian Security Service refuses to give further comments.

I don’t think that emailing something like “I will kill you” is prosecutable under Ukrainian law, but anyway this story sounds ridiculous.