Why there is no FaceTime in my 4s?

Complain to the UAE government, as they're the one's that require the FaceTime ban, and no, there is no way to enable FaceTime on your phone. You want FaceTime? Sell your phone before you go back to Russia, and purchase an iPhone when you get there. Unless the UAE government changes its stance, FaceTime can NEVER be enabled on your phone, no matter where you live or use the phone.

option number 4 at the very bottom of the page.

4 - Requires a FaceTime-enabled Mac with an Internet connection or a FaceTime-enabled iOS device with a Wi-Fi connection. Not available in all areas.

Actually, on that same page, under the section:

FaceTime.* It’s even better face to face.

is the caveat "* FaceTime is not available in the United Arab Emirates."

Apple was indeed being not only upfront about it, but quite explicitly so.

If FaceTime was that critical when purchasing your iPhone surely it's reasonable to expect that YOU ask at the point of sale or do your research beforehand. Apple cannot anticipate the specific needs/wants of an individual who purchase their iPhones, therefore they attempt to manage people's expectation by placing information of their web site. You cannot hold Apple responsible for your lack of research. Your argument should be with the UAE Government and not Apple as it is at the express wish of the UAE Government that FaceTime has been removed, as previously stated by others in this post.