The Secret Service did not deny that this former embassy employee was suspected to be a Russian spy, but they insisted that foreign service nationals employed by USA embassies do not have access to national security information.
"We knew it was happening and it was just a process of playing it out and giving her specific information that we saw her give back to the FSB", the source revealed.
The British daily alleged in its report that: "The Russian national had been hired by the US Secret Service and is understood to have had access to the agency's intranet and email systems, which gave her a potential window into highly confidential material including the schedules of the president and vice-president".
"At no time, in any U.S. Secret Service office, have FSNs been provided or placed in a position to obtain national security information".
After detecting spy guide Secret service allegedly tried to hush up the scandal, quickly dismissing her and not appointing internal investigation.
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The spy was sacked last summer, sources told the paper, shortly before the Kremlin demanded the expulsion of 750 USA personnel after Washington increased sanctions of the country.
"We figure all of them are talking to the FSB, but she was giving them way more information than she should have", the official told CNN.
"This is of particular emphasis in Russian Federation".
Acknowledging that foreign nationals can clearly be influenced by foreign intelligence agencies at any time, the agency noted that this situation is specifically tailored to Russian Federation. "As a result, the duties are limited to translation, interpretation, cultural guidance, liaison and administrative support", it continued.
United States secret service admitted that foreign Embassy staff may also be affected by the intelligence of another country, so the level of control and secrecy is very high. The security office was alerted to the spy's unauthorized meetings with the FSB, a Russian intelligence agency.
Butina is accused of infiltrating a pro-gun rights organization in the U.S.at the behest of a high-powered Russian official, as part of a mission to influence US foreign policy towards Russia.