Good info, my source:

http://intelligence-summit.blogspot....ussian-pm.html

Mr Gaidar declined to comment about whether he believed he had suffered a poisoning attack. The news of his illness comes after a series of mysterious incidents involving Russian public figures over the past month. It emerged as the Kremlin and state-run television continued to suggest the murky world of Russia’s recent émigrés was behind the death of Mr Litvinenko.