The documents called Chaika a "key source of information on Russia" and said he commented on methods used by Prime Minister Vladimir Putin to ensure the stability of his regime, RIA-Novosti reported.
Spokesperson for the Prosecutor General's Office Marina Gridneva denied Chaika was an informant, telling the news agency, "All these stories are a provocation."
The information released included internal communications at Stratfor from July 2009 to December 2011. WikiLeaks said it has over 5 million emails from employees written from June 2004 to December 2011, all of which they eventually plan to publish, Kommersant reported.
Unlike information previously released by WikiLeaks that was leaked from official sources, the current data was obtained by hacker group Anonymous in an attack that also revealed the credit card information of Stratfor customers.
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