The domain un.com does not resolve/show for me, so I'm wondering where you got this (you did say "I have a domain with UN.com"). It does, however, come-back as owned by a private indivual (who's email is AOL - likely not a company at all - and the domain of the name-servers do not resolve either). I am pretty sure that the reason for that (the un.com itself) not resolving is simple - the owner doesn't want the United Nations to go after the name itself (or they currently have a claim/case going that I could not find). Certain entities, like the US and others have made agreements with the CentralNic Corporation (who owns eu.com, cn.com, ru.com, us.com, ect) for registering them or reselling sub-domains (called "third-level" domains, since the actual us.com, eu.com, ect. are actually no more than regular domains themselves). Matter-of-fact, all of those registerable by CentralNic and it's authorized resellers, are 100% legal in-and-of themslves and recognized by such in the respective country and by ICANN (the international authority over domains).
I imagine, since the United Nations has gone after many names (worldbank.net comes to mind - legal decision taking it away - yet, oddly enough, they just later let that domain expire and some other "not so wise" domainer has re-registered it ). Like I said, I don't know where you're getting a sub to the domain "un.com" from. But, regardless (that private owner could just sell you all the sub-domains he wants, I guess), I wouldn't risk it. You spend forever developing a site (or doing all that work to promote it for whatever reason), and the United Nations later just steps in and takes it away from current owner. The United Nations will, more than likely, do that one day (and, seeing as it was first registered way back in 1994, maybe the only reason they haven't yet is becuase it doesn't resolve)...simply to avoid confusion of internet users thinking sites on it are United Nations approved or affiliated....Worth that risk?..
Either way, seeing the United Nations' past of going after names, I'd warn BIG caution..
Has the UN gone after other domainers? I don't remember reading any news about that. If so, do you have any links to articles about it?..
Do you mean a name like rUN.COM? That would be not only legal but quite valuable...
He used two russian? characters to put together un.com .............
That would be cyrillic.
Unless this is a common russian expression or acronym I don't see much value in it..
Note: always make it perfectly clear that these are cyrillic characters..
Could also stand for Utter Nonsense..
Just don't put up there any content related to the united nations..
You don't want to do that...