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Yahoo News obtained a declassified summary of the report, which also describes the role of two state-owned media outlets, RT and Sputnik, in what some experts say is an increasingly aggressive "information warfare" campaign. According to the report, the outlets promote Russia's political aims with programming targeted to "activist" audiences including "far-right and far-left elements of European society." It adds that the RT channel gives "disproportionate coverage and airtime to the European Parliament's more extreme factions."

Read alsoABC News: FBI warns of cyberattacks on state election boardsThe report, by the office of Director of National Intelligence James Clapper, was originally requested by congressional intelligence committees late last year. The panels also asked for a separate report on Russia's use of political assassination. Classified versions of both documents were delivered by Clapper's office to Capitol Hill in July.

The decision to declassify brief excerpts from the first report coincides with recent disclosures about suspected Russian cyberattacks on the Democratic National Committee and other political groups. Many in the U.S. intelligence community believe that indicates Russia has expanded its cyberwar and disinformation efforts to the United States. "This is the 21st century version of 'active measures,'" said Heather Conley, director of the Russia program at the Center for Strategic and International Studies (CSIS), a reference to the Cold War term for the Soviet Union's efforts to manipulate Western opinion by spreading false information, such as the claim that U.S. scientists had manufactured the AIDS virus as part of a biological weapons project at Fort Detrick, Md.

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Read alsoRussian trolls caught red-handed again, target Dutch voters ahead of referendum on UkraineConley added that the use of "information warfare" techniques to pursue political goals has now been incorporated into official Russian military doctrine. The goal, she said, is not "the annihilation" of the country's enemies, but to "weaken them from within" by "keeping everybody off balance" and "sowing doubt" about their political leaders and institutions. A report by Conley describing this effort is due to be released by CSIS next month.

Read alsoKremlin propagandists spotted in anti-Ukrainian campaign in NetherlandsAlthough the activities of the Russian trolls have been aired in a handful of media accounts in recent years, the decision to include references to them in the declassified DNI summary appears to be part of a stepped-up effort by Washington to publicly combat Russian Internet efforts and cyberattacks. The full report covers a much broader subject: the scope of Russian influence operations throughout Europe and Central Asia, including the covert funding of political parties and nongovernmental organizations.

"Moscow has been opportunistic in its efforts to strengthen Russian influence in Europe and Eurasia by developing affiliations with and deepening financial or political connections to like-minded political parties and Non-governmental Organizations," according to a letter containing the declassified excerpts that was sent this week by Clapper's office to House Intelligence Committee Chair Rep. Devin Nunes and ranking minority member Rep. Adam Schiff.

"Moscow appears to use monetary support in combination with other tools of Russian statecraft, including propaganda in local media, direct lobbying by the Russian Government, economic pressure, and military intimidation," the letter states.

Read alsoKiselyov leaks: Russia's controversial chief propagandist's mail hackedThe declassified excerpts don't include specific examples. But a separate report on the same subject earlier this year by the Congressional Research Service, prepared at the request of Rep. Chris Stewart, a Republican from Utah, cited as evidence Russian financial and political support for far-right, anti-immigrant European political parties, including the National Front in France and Jobbik in Hungary. The French National Front, which is headed by Marine Le Pen and which backed Russia's annexation of Crimea, has received a loan of 9 million euros from a Russian bank with close ties to Putin, the CRS report notes, and Jobbik's finances have been under investigation by the Hungarian Parliament amid allegations that it had received funding from Moscow.