Transition period for hygienic certificates was extended.
Old Hygienic Certificates and State Registrations are not suspended after 1th January 2012. These documents will be valid until their expiration date. It's important to remember that old hygienic documents remain in force only on the territory of the country whose authorities issued this document. The only document valid for the whole territory of the Customs Union is New State Registration, issued under the United Hygienic Rules of the Customs Union.
The detailed information regarding these changes can be found on Rospotrebnadzor.ru - oficial Rospotrebnadzor site.