Interviews and previously sealed FBI documents reveal that the Clintons and the State Department, specifically under Hillary Clinton's stewardship, were the subjects of an intense influence campaign orchestrated by the Russian government, according to a report Sunday.

"There is not one shred of doubt from the evidence that we had that the Russians had set their sights on Hillary Clinton's circle because she was the quarterback of the Obama-Russian reset strategy and the assumed successor to Obama as president," a source familiar with the FBI's investigation around 2010 told The Hill.

While there is no proof of any illegal acts on the part of both Hillary and Bill Clinton, some of the evidence collected by the FBI included how a Russian undercover spy used the name "Cynthia Murphy" and the identity of an accountant targeted Alan Patricof — a New York financier and active fundraiser for Hillary Clinton — before the sleeper agent and nine others were apprehended and deported in 2010.

"Send more info on current international affairs vital for [Russia], highlight U.S. approach," said an October 2009 communication between a Russian handler and two spies that was intercepted by the FBI. "Try to single out tidbits unknown publicly but revealed in private by sources closer to State Department, government, major think tanks."

Days after members of the sleeper ring were arrested, the FBI learned Bill Clinton had received a $500,000 check from Renaissance Capital, a Kremlin-linked bank, for a single 90-minute speech. Bill Clinton then also met with Vladimir Putin himself, FBI agents said.

The payment followed Hillary Clinton helping to arrange for American technology executives to visit Russia to support then-Russian President Dmitry Medvedev's aspiration of emulating Silicon Valley within their own borders, agents said.

In addition, while looking into allegations of bribery and kickback allegations levied at TENEX, a subsidiary of Moscow's state-controlled nuclear energy company, the FBI uncovered other connections to the Clintons.

Foreign agent registration records detail how TENEX hired a Washington firm to successfully lobby the Obama administration for billions of dollars worth of commercial nuclear business. At the time it was hired, the firm was also providing hundreds of thousands of dollars a year in pro bono support to Bill Clinton's global charitable initiative.

"In the end, some of this just comes down to what it always does in Washington: donations, lobbying, contracts and influence — even for Russia," Frank Figliuzzi, the former FBI assistant director for counterintelligence, told The HIll.

Representatives for the Clintons and Patricof all deny any wrongdoing.