The CIA was warned over a plot to kill John F. Kennedy three months before his assassination, new documents have shown.

The claim was contained in more than 2,000 documents released by into the death of the US president amid controversy. However, conspiracy theorists have been left bitterly disappointed following the papers' release after they provided no further insight to back up claims of a second shooter or a government hit. Critics attacked Trump, who pushed ahead with the file release, as his aides had said Americans would be left "shocked" by what the 63,000 pages revealed. The President had vowed there would be no redactions within the papers, only for thousands to have large swathes of text blacked out.

The files span a range of materials, including FBI reports, CIA memos, and Secret Service records, detailing the events surrounding Kennedy's assassination in Dallas on November 22, 1963.

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The documents also cover subsequent investigations into the actions of Lee Harvey Oswald, who killed the president, as well as numerous conspiracy theories that have circulated since the event. However, the mass release of these documents failed to provide any new information that some had hoped for.

By the time they were made public on Tuesday evening, some of America's top national security officials had spent hours trying to assess any possible security hazards under extreme deadline pressure.

The top takeaways are:

One of the most alarming disclosures is that the CIA had received warnings months before November 1963 about a possible plot to assassinate President Kennedy. The files detail a letter sent by a man named Sergyj Czornonoh in 1978 to the British Embassy.

He claimed that he was detained in London on July 18, 1963 and questioned by authorities. Czornonoh said that he told them about Lee Harvey Oswald, saying he planned to kill the president.

He added that he warned American Vice Consul Tom Blackshear of the plans of Oswald, who was trying to defect to .

Contrary to the portrayal of Oswald as a skilled marksman, the declassified documents suggest that he was considered a "poor shot" despite his time in the US Marine Corps. One line in the documents stated that KGB monitored Oswald while he was in the USSR.

Included in the papers was a memo from the CIA's St Petersburg station dated November 20, 1991, it stated the former security agency for the Soviet Union, watched Oswald closely. The report cites a KGB official named Nikonov who had reviewed five thick files about the killer to determine if he was part of the now-defunct Soviet secret police. He determined Oswald was not.

He did, however, comment on Oswald's marksmanship and said he was a "poor shot when he tried target firing in the USSR."

A memo released by a left-wing magazine questioned the possible role of John Garrett Underhill Jr., a former Army Captain and CIA agent.The passage, released by Ramparts in July 1967, reads: "The day after the assassination, Gary Underhill left Washington in a hurry. Late in the evening, he showed up at the home of a friend in New Jersey. He was very agitated.

"A small clique within the CIA was responsible for the assassination, he confided, and he was afraid for his life and probably would have to leave the country." Underhill had told his friends that JFK "got wind" of the attempt on his life but was "killed before he could 'blow the whistle on it.'"

On May 8, 1964, Underhill was found dead in his Washington apartment, which the coroner ruled as suicide. According to the memo, Underhill's friends said before his death that he was "sober but badly shook" by the president's assassination.

One document details how an American professor named E.B. Smith was befriended by a CIA agent working in the St Petersburg station in the months before the assassination.Smith is thought to have confided in the agent about a friend, a KGB official known as "Slava" Nikonov, who had reviewed the files held by the organisation on Oswald.The document states: "Nikonov is now confident that Oswald was at no time an agent controlled by the KGB."Another CIA memo describes Oswald phoning the Soviet Embassy asking for a visa while in Mexico City in late September and early October 1963.Oswald also visited the Cuban Consulate in Mexico City seeking a travel visa so he could wait there for a Soviet visa, per the memo.More than a month before John F Kennedy's assassination on October 3, 1963, Oswald drove back to the US through a crossing point at the Texas border.

One of the most compelling discoveries is new evidence linking Jack Ruby more extensively to organised crime. Born Jacob Leon Rubenstein in Chicago, Ruby had a history of involvement in illegal gambling and racketeering. Previously dismissed as a lone actor seeking vengeance for Kennedy, the new files suggest Ruby may have been directed to silence Oswald before he could reveal deeper conspiracies.

Two days after JFK was killed, Oswald was being transferred from one jail to another in Dallas, Ruby, a nightclub owner, shot and killed him in the basement garage of the Dallas jail.

The newly released files reveal that Lee Harvey Oswald, the alleged assassin, had significant interactions with the Soviet Union prior to the assassination.

He had previously defected to the USSR in 1959, and his connections with Soviet officials remained under scrutiny by US intelligence agencies upon his return to the States.

Per a 1991 CIA memo, KGB agent Nikonov commented that Oswald had "a stormy relationship with his Soviet wife, who rode him incessantly."

The President's Commission of the Assassination of President John F. Kennedy in September 1964 also commented on the couple's tumultuous relationship.

However, it reported: "The commission does not believe that the relations between Oswald and his wife caused him to assassinate the President."