Game is a region-restricted Steam-Gift:

This is a restricted gift which can only be redeemed in these countries: Armenia, Azerbaijan, Belarus, Georgia, Kyrgyzstan, Kazakhstan, Moldova, Republic of, Tajikistan, Turkmenistan, Uzbekistan, Ukraine, Russian Federation
In addition, if you decide to redeem this restricted gift, you can only play it within the countries listed above. Note that using an IP proxy or other methods to disguise the place of your residence to activate this gift is a violation of the Steam Subscriber Agreement and may result in restrictions on this Steam account.

Edit: I'm not Russian, so please comment in English, if it is something directed to me. Thanks.