Because it's region restricted and you need to use VPN to bypass it + it's exploited. Read Term of Usage:
- Keys Considered Exploited:
Call of Duty: Modern Warfare 3
| Do not attempt to trade what we consider exploited CD-keys.
http://www.steamtrades.com/trade/gCrkO/steamtrades-site-rules
- Do not offer to trade CD-keys that require VPN activation or methods to bypass regional restrictions.
1 decade ago
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New Bundles
this key just works for russia