nothing good this letter portends - was probably filed some sort of complaint on the website.
Of course. Someone complained to the site, the Registrar checked, found that there is crap and in accordance with the rules of the domain zone sent the notification (for .EN .su .RF - confirmation is required, this warn all sane domainer), who looked through the EV domain, alerted domainer, that alerted You.
It all depends on the level of Chernukha on the website - if it's not too horrible, and it is possible to send the data. If there is something you can really ogrebayut - mirror site somewhere and write off everything .EN .su .Russian domains in the section of combat losses :)