JFK assassination was most likely the result of Operation Northwoods, which was most likely the creation of those mentioned in the Venona intercepts

"We are opposed around the world by a monolithic and ruthless conspiracy that relies primarily on covert means for expanding its sphere of influence--on infiltration instead of invasion, on subversion instead of elections, on intimidation instead of free choice, on guerrillas by night instead of armies by day.“

It is a system which has conscripted vast human and material resources into the building of a tightly knit, highly efficient machine that combines military, diplomatic, intelligence, economic, scientific and political operations.

“Its preparations are concealed, not published. Its mistakes are buried, not headlined. Its dissenters are silenced, not praised. No expenditure is questioned, no rumor is printed, no secret is revealed."

The Protocols of the Elders of Zion  is a fabricated antisemitic text purporting to describe a Jewish plan for global domination. The hoax, which was shown to be plagiarized from several earlier sources, some not antisemitic in nature, was first published in Russia in 1903, translated into multiple languages, and disseminated internationally in the early part of the 20th century.

 The Nazis sometimes used the Protocols as propaganda against Jews; it was assigned by some German teachers, as if factual, to be read by German schoolchildren after the Nazis came to power in 1933

 It was known at the Nuremberg trials the existence of the secret protocol of the German–Soviet pact regarding the planned divisions of these territories

The Soviet Union signed a non-aggression pact with Nazi Germany on 23 August 1939. In addition to stipulations of non-aggression, the treaty included a secret protocol that divided territories of Romania, Poland, Lithuania, Latvia, Estonia, and Finland into German and Soviet Union "spheres of influence", anticipating potential "territorial and political rearrangements" of these countries.In October and November 1940, German-Soviet talks about the potential of joining the Axis took place in Berlin, nothing came from the talks since Hitler's Ideological goal was Lebensraum in the East.
Germany invaded Poland on 1 September 1939 starting World War II, Stalin waited until September 17th before launching his own invasion of Poland.

On 22 June 1941, Hitler launched an invasion of the Soviet Union. Stalin was confident that the total Allied war machine would eventually stop Germany, and with Lend Lease from the West, the Soviets stopped the Wehrmacht some 30 kilometers (or 18.6 miles) from Moscow. Over the next four years, the Soviet Union repulsed Axis offensives, such as at the Battle of Stalingrad and the Battle of Kursk, and pressed forward to victory in large Soviet offensives, such as the Vistula–Oder Offensive.

Stalin met with Winston Churchill and Franklin D. Roosevelt at the Tehran Conference and began to discuss a two-front war against Germany and the future of Europe after the war. Berlin finally fell in April 1945.

was a guarded concrete barrier that physically and ideologically divided Berlin from 1961 to 1989.

Even though the persecutions provided the impetus for mass emigration, there were other relevant factors that can account for the Jews' migration. After the first years of large emigration from Russia, positive feedback from the emigrants in the U.S. encouraged further emigration. Indeed, more than two million Jews fled Russia between 1880 and 1920. While a large majority emigrated to the United States, some turned to Zionism. In 1882, members of Bilu and Hovevei Zion made what came to be known the First Aliyah to Palestine, then a part of the Ottoman Empire.

Lee Harvey Oswald was an American Marxist and former U.S. Marine who assassinated United States President John F. Kennedy on November 22, 1963.

Oswald was honorably released from active duty in the Marine Corps into the reserve and defected to the Soviet Union in October 1959. He lived in Minsk until June 1962, when he returned to the United States with his Russian wife, Marina, and eventually settled in Dallas.

Oswald enlisted in the United States Marine Corps on October 24, 1956, just a week after his seventeenth birthday.

Like all marines, Oswald was trained and tested in shooting. In December 1956, he scored 212, which was slightly above the requirements for the designation of sharpshooter.

Oswald was later punished for a third incident: while he was on a night-time sentry duty in the Philippines, he inexplicably fired his rifle into the jungle.

 on February 25, 1959, he was invited to take a Marine proficiency exam in written and spoken Russian. 

On September 11, 1959, he received a hardship discharge from active service, claiming his mother needed care. He was placed on the United States Marine Corps Reserve

Oswald traveled to the Soviet Union just before he turned 20 in October 1959; he had planned the trip well in advance by teaching himself Russian and saving $1,500 of his Marine Corps salary (equivalent to $10,500 in 2019).

Almost immediately after arriving, Oswald informed his Intourist guide of his desire to become a Soviet citizen. When asked why by the various Soviet officials he encountered — all of whom, by Oswald's account, found his wish incomprehensible — he said that he was a communist, and gave what he described in his diary as "vauge  answers about 'Great Soviet Union'". On October 21, the day his visa was due to expire, he was told that his citizenship application had been refused, and that he had to leave the Soviet Union that evening.

Distraught, Oswald inflicted a minor but bloody wound to his left wrist in his hotel room bathtub soon before his Intourist guide was due to arrive to escort him from the country, according to his diary because he wished to kill himself in a way that would shock her. Delaying Oswald's departure because of his self-inflicted injury, the Soviets kept him in a Moscow hospital under psychiatric observation until October 28, 1959.

According to Oswald, he met with four more Soviet officials that same day, who asked if he wanted to return to the United States. Oswald replied by insisting that he wanted to live in the Soviet Union as a Soviet national. When pressed for identification papers, he provided his Marine Corps discharge papers.

He told the U.S. embassy interviewing officer, Richard Edward Snyder, that "he had been a radar operator in the Marine Corps and that he had voluntarily stated to unnamed Soviet officials that as a Soviet citizen he would make known to them such information concerning the Marine Corps and his specialty as he possessed. He intimated that he might know something of special interest."

(Such statements led to Oswald's hardship/honorable military reserve discharge being changed to undesirable.)[

Though Oswald had wanted to attend Moscow State University, he was sent to Minsk to work as a lathe operator at the Gorizont Electronics Factory, which produced radios, televisions, and military and space electronics.

 Stanislau Shushkevich, who later became independent Belarus's first head of state, was also engaged by Gorizont at the time, and was assigned to teach Oswald Russian.

Oswald received a government-subsidized, fully furnished studio apartment in a prestigious building and an additional supplement to his factory pay, which allowed him to have a comfortable standard of living by working-class Soviet standards,

Oswald wrote in his diary in January 1961: "I am starting to reconsider my desire about staying. The work is drab, the money I get has nowhere to be spent. No nightclubs or bowling alleys, no places of recreation except the trade union dances. I have had enough." Shortly afterwards, Oswald (who had never formally renounced his U.S. citizenship) wrote to the Embassy of the United States, Moscow requesting return of his American passport, and proposing to return to the U.S. if any charges against him would be dropped

In March 1961, Oswald met Marina Prusakova (b. 1941), a 19-year-old pharmacology student; they married less than six weeks later in April.The Oswalds' first child, June, was born on February 15, 1962. On May 24, 1962, Oswald and Marina applied at the U.S. Embassy in Moscow for documents that enabled her to immigrate to the U.S. On June 1, the U.S. Embassy gave Oswald a repatriation loan of $435.71. Oswald, Marina, and their infant daughter left for the United States, where they received less attention from the press than Oswald expected.

Although the Russian émigrés eventually abandoned Marina when she made no sign of leaving her husband

and that he once saw Oswald reading a Russian-language publication. Oswald was fired almost 6 months later, on the first week of April 1963.

In March 1963, Oswald used the alias "A. Hidell" to make a mail-order purchase of a secondhand 6.5 mm caliber Carcano rifle for $29.95. He also purchased a .38 Smith & Wesson Model 10 revolver by the same method.

The Warren Commission concluded that Oswald attempted to kill retired U.S. Major General Edwin Walker on April 10, 1963

Walker enjoyed enthusiastic crowds all over the United States. His message of anti-communism was popular. He also promoted the McCarthyist belief that communists were inside the United States government. 

Marina Oswald testified that her husband told her that he traveled by bus to General Walker's house and shot at Walker with his rifle. She said that Oswald considered Walker to be the leader of a "fascist organization."

On May 26, Oswald wrote to the New York City headquarters of the pro-Castro Fair Play for Cuba Committee, proposing to rent "a small office at my own expense for the purpose of forming a FPCC branch here in New Orleans". Three days later, the FPCC responded to Oswald's letter advising against opening a New Orleans office "at least not ... at the very beginning.

On May 29, Oswald ordered the following items from a local printer: 500 application forms, 300 membership cards, and 1,000 leaflets with the heading, "Hands Off Cuba"

According to anti-Castro militant Carlos Bringuier, Oswald visited him on August 5 and 6 at a store he owned in New Orleans. Bringuier was the New Orleans delegate for the anti-Castro organization Directorio Revolucionario Estudantil (DRE). Bringuier would later tell the Warren Commission that he believed Oswald's visits were an attempt by Oswald to infiltrate his group. On August 9, Oswald turned up in downtown New Orleans handing out pro-Castro leaflets. Bringuier confronted Oswald, claiming he was tipped off about Oswald's leafleting by a friend. A scuffle ensued and Oswald, Bringuier, and two of Bringuier's friends were arrested for disturbing the peace.

He arrived in Mexico City on September 27, where he applied for a transit visa at the Cuban Embassy, claiming he wanted to visit Cuba on his way to the Soviet Union. The Cuban embassy officials insisted Oswald would need Soviet approval, but he was unable to get prompt co-operation from the Soviet embassy. CIA document notes Oswald spoke "terrible hardly recognizable Russian" during his meetings with Cuban and Soviet officials.

After five days of shuttling between consulates — and including a heated argument with an official at the Cuban consulate, impassioned pleas to KGB agents, and at least some CIA scrutiny — Oswald was told by a Cuban consular officer that he was disinclined to approve the visa, saying "a person like [Oswald] in place of aiding the Cuban Revolution, was doing it harm."

eleven days before the assassination of President Kennedy, Oswald wrote to the Soviet embassy in Washington, D.C., saying, "Had I been able to reach the Soviet Embassy in Havana, as planned, the embassy there would have had time to complete our business."

According to a CIA document released in 2017, it is possible Oswald was trying to get the necessary documents from the embassies to make a quick escape to the Soviet Union after the assassination.

Oswald left a note that, according to the receptionist, read: "Let this be a warning. I will blow up the FBI and the Dallas Police Department if you don't stop bothering my wife" [signed] "Lee Harvey Oswald".

Agent Hosty said that he destroyed Oswald's note on orders from his superior, Gordon Shanklin, after Oswald was named the suspect in the Kennedy assassination.

In 1979, the United States House Select Committee on Assassinations (HSCA) concluded that Kennedy was probably assassinated as a result of a conspiracy.

 FBI Director Hoover wrote a memo detailing that the Dallas Police would not have had enough evidence against Oswald without the FBI's information.

Top government and intelligence officials were also finding that, according to CIA intercepts, someone had impersonated Oswald in phone calls and visits made to the Soviet and Cuban embassies in Mexico City several weeks before the assassination.

Over the next 40 years this became one of the CIA’s most closely guarded secrets on the Oswald case.

The Central Intelligence Agency advised that on October 1st, 1963, an extremely sensitive source had reported that an individual identifying himself as Lee Oswald contacted the Soviet Embassy in Mexico City inquiring as to any messages. Special agents of this Bureau, who have conversed with Oswald in Dallas, Texas, have observed photographs of the individual referred to above and have listened to a recording of his voice. These special agents are of the opinion that the referred-to individual was not Lee Harvey Oswald.

With the information that someone had been impersonating Oswald, President Johnson expressed concern that the public might come to believe that Soviet leader Nikita Khrushchev and/or Cuban leader Fidel Castro was implicated in the assassination — a situation that Johnson said might lead to "... a war that [could] kill 40 million Americans in an hour". Johnson relayed his concern to both Chief Justice Earl Warren and Senator Richard Russell, telling them that they could "serve America" by joining the commission Johnson had established to investigate the assassination, which would later become known unofficially as the Warren Commission

Katzenbach wrote: "Speculation about Oswald’s motivation ought to be cut off

He also wrote: "The public must be satisfied that Oswald was the assassin; that he did not have confederates who are still at large; and that the evidence was such that he would have been convicted at trial"

The House Select Committee on Assassinations wrote: "The committee believes, on the basis of the evidence available to it, that anti-Castro Cuban groups, as groups, were not involved in the assassination of President Kennedy, but that the available evidence does not preclude the possibility that individual members may have been involved"

With the 1959 Cuban Revolution that brought Fidel Castro to power, many Cubans left Cuba to live in the United States. Many of these exiles hoped to overthrow Castro and return to Cuba. Their hopes were dashed with the failed Bay of Pigs Invasion in 1961, and many blamed President Kennedy for the failure

The Warren Commission reported that they found no evidence that the Soviet Union was involved in the assassination of President Kennedy.

The Cuban Missile Crisis was a 13-day confrontation between the United States and the Soviet Union initiated by the American discovery of Soviet ballistic missile deployment in Cuba. The confrontation is often considered the closest the Cold War came to escalating into a full-scale nuclear war.