What I have in my timeline regarding Rosenstein in the early years:
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2009: Rosatom, a Russian company began making overtures to Uranium One in Kazakhstan. Uranium One turned to theAmerican and Canadian embassiesthere for help. American embassies were under the Secretary of State–Hillary Clinton. The FBI then began their investigation of Tenex, Rostam's subsidiary, and Tenam, their U.S. company, but they would ultimately keep quiet about the real crimes. The Director of the FBI at that time was headed by Robert Mueller. The investigation was led by then-Assistant FBI Director Andrew McCabe, and U.S. Attorney Rod Rosenstein at Justice. The DOJ's Fraud Section was then headed by Andrew Weissmann, the second of Mueller in the future collusion investigation against Trump. The Director of National Intelligence (DNI) was James Clapper. William Campbell was the Confidential Source-1 (CS-1), the FBI contractor, who had reported his concerns in regard to the Russian company who had hired him as a lobbyist. Campbell began working undercover, and his involvement with the company enabled him to penetrate Putin's inner circle. Evidence indicated Russian officials gave millions of dollars to the Clinton Foundation while she was Secretary of State and on the Committee on Foreign Investment of the United States (CFIUS) which reviewed sales of U.S. companies or assets relative to national security. The FBI attempted to get the head of Tenex and Tenam, Mikerin, to flip, but he resisted, and years later, Justice prosecuted him on lesser charges, keeping the worse crimes implicating the Clinton Foundation and the Obama administration, under wraps.== The Obama administration officially issued a visa for Mikerin in 2010, but the FBI's racketeering investigation revealed he had been operating in the U.S. since at least 2009. Campbell was hired by Mikerin in 2009 as a D.C. lobbyist, but when Campbell realized what was occurring, he had contacted the FBI, and the FBI, under Mueller, contracted him as an undercover informant.
August, 2009: The arrest order of the Russian executive Mikerin was overturned by prosecutors,one of whom was Rod Rosenstein who signed the appeal,with the excuse the DOJ and FBI were hoping he would still flip on the Russian company. The charges were to be presented again in 2010.