Original sentence: According to Sergei Kiriyenko, the head of Russia's state atomic energy agency, RosAtom, all of it goes to U.However, this was disputed in a New York Sun article written by Edward Jay Epstein in March 2008, who says that  neither Russia nor any other country in the world admitted manufacturing any Polonium-210 at all in 2006.Russian state openly acknowledged the production and trade of polonium in framework of international Nuclear non-proliferation agreements
Edited sentence: According to Epstein, neither Russia nor any other country in the world admitted manufacturing any Polonium-210 at all in 2006.According to a claim by Sergei Kiriyenko, the head of Russia's state atomic energy agency, RosAtom, all of it goes to U.Mr Epstein refers to the IAEA's Illicit Trafficking Data Base mentioning 14 incidents of missing industrial Polonium-210 since 2004.This was disputed in a New York Sun article written by Edward Jay Epstein in March 2008, who says the claims are "at best speculation"