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.

Won this on a different site, but the guy didn't mention the Region Lock, so can't use it. :(

Still, my loss is another person's gain. :)