Is it worth to buy domains 3 levels?

to razdelyat can
but it should be an exceptional case

alas, the third level in the reactor is not quoted, although the search engines do not care

If for some ridiculous reason, razdelyat domain

In the ru-zone can of course. You may need a piece of paper from the court, but to the absurd courts had long been accustomed to. In the third level will add another link with its absurdities - the administration of the second level domain in which you are buying third.

"Nine and a half rules"? No, not heard.

Briefly.
1. In the zone .com unable to get even steeper. Without the courts, and explanations. Godaddy or another someone will attribute you to the Crimea, or the Donbas, or to Putin. And lose all.
2. If your brand name is already taken, so the brand is not unique. Then he could, with our ("from a fence till a dinner") law practice otyat in .EN.
3. Do not try to buy as many short, even with errors, the domain name. In the era of search supercars is solely for everybody. You normal website SEO and so you will find.
4. Create a brand logo and then the domain. Even if long. In .EN preferably with a clearly spoken and clearly transliterature letters abvgdezijklmnoprstufhy (ABVGDEZIJKLMNOPRSTUFHYE).
In the Russian language, unlike English and German, it is quite possible a dash to separate the individual words:
for example, vne-dorog.ru or tovary-domoj.ru. But not consoles. In particular, "the age"as "web site" are written together (consoles) and the Internet store through the dash.
It is possible to tell the trend. For example, vse-o-tarakanah.ru

to them subject to the same legal standards as to *.EN?

Of course. They are the same in Russia :)

If for some ridiculous reason, razdelyat domain

Easily.

these zones do not apply to the legislation of the Russian Federation.

But applies "the law-a taiga" name RKN

In General, if you are employed in .EN and problems with the law is not expected to take .su or international domains. One of the TLDs you can see .biz .info

no don't take