Lee Harvey Oswald, the alleged assassin of former United States President John F. Kennedy, met with an agent from KGB two months before Democrat was fatally shot in Texas’ Dallas, new documents released by the National Archives reveal.

The National Archives declassified and dumped nearly 1,500 documents for public viewing on Wednesday, a move President Joe Biden had vowed during his 2020 campaign.

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According to reports from New York Post citing the documents, Oswald met a senior Russian spy in Mexico City in September 1963. Kennedy was assassinated on November 22 later that year.

The document read, “According to an intercepted phone call in Mexico City, Lee Oswald was in the Soviet Embassy there on 23 September and spoke with Consul Valeriy Vladimirovich”, according to reports from New York Post.

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Tennent Bagley, then-acting chief of CIA, wrote in a memo, “Oswald called the Soviet Embassy on 1 October, identifying himself by name and speaking broken Russian, stating the above and asking the guard who answered the phone whether there was anything concerning the telegram to Washington.”

The documents– released by the National Archives on Wednesday– were gathered by authorities during a five-year review of the Presidential assassination. However, a large number of documents are reportedly still kept from the public eye.

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The Biden administration delayed the document release earlier this year, blaming the COVID pandemic. According to reports from CNN, an individual familiar with the release said that it was delayed to “protect against identifiable harm to the military defense, intelligence operations, law enforcement, or the conduct of foreign relations that is of such gravity that it outweighs the public interest in the immediate disclosure.”

Oswald, who was fatally shot by Dallas bar owner Jack Ruby days after his arrest, is still tied to unsolved mysteries linked to the assassination of the former President.