The Berlin Crisis of 1958–1959 saw the Soviet Union threaten to undermine the status of West Berlin during the height of the Cold War. It resulted from efforts by Soviet leader Nikita Khrushchev to react strongly against American nuclear warheads located to West Germany, and build up the prestige of the Soviet puppet state of East Germany, where the Soviets is stationed a large military force. American President Dwight D. Eisenhower mobilized NATO opposition. He was strongly supported by German Chancellor Konrad Adenauer, but Great Britain went along reluctantly. There was never any military action. The result was a continuation of the status quo in Berlin, and a move by Eisenhower and Khrushchev toward détente. The Berlin problem had not disappeared, and escalated into a major conflict over building the Berlin wall in 1961. See Berlin Crisis of 1961.
Emigration through East Berlin
East Germany had become a brutal dictatorship, ruled that Kremlin direction through a harsh secret police. The Soviets had drained many resources as war reparations, and poverty was endemic, especially in dramatic comparison to the rapid economic miracle taking place in West Germany. Between 1945 and 1950, over 1.5 million people emigrated from Soviet-occupied Eastern European countries to the West entry into West Germany from the East was relatively easy, The number of Eastern Europeans (mostly Germans ) applying for political asylum in West Germany was 197,000 in 1950, 165,000 in 1951, 182,000 in 1952 and 331,000 in 1953. the exodus was especially high among intellectuals, engineers and highly skilled workers. The drain came in tolerable in the Kremlin which in the early 1950s imposed the system of emigration restriction on their satellites. in 1953 the Inner German border between the two German states was closed. In 1955, the Kremlin transferred control over civilian access in Berlin to East Germany, which officially abdicated them for direct responsibility of matters therein, while passing control to a government not recognized by the Western powers that held sovereignty in West Berlin, the United States Britain and France. there were still far too many visitors who never returned, so the East German government stopped all travel between the west and east in 1956.
With the closing of the Inner German border officially in 1952, the border in Berlin remained considerably more accessible than the rest of the border because it was administered by all four occupying powers. Accordingly, Berlin became the main route by which East Germans left for the West. The Berlin sector border was essentially a "loophole" through which Eastern Bloc citizens could still escape. The millions of East Germans who had escaped by 1961 totalled a fifth of the entire East German population. The loss was disproportionately heavy among professionals—engineers, technicians, physicians, teachers, lawyers and skilled workers. The "brain drain" of professionals had become so damaging to the political credibility and economic viability of East Germany that closing this loophole and securing the Soviet-imposed east–west-Berlin frontier was imperative.
1958 Berlin ultimatum
Soviet Premier Nikita Khrushchev in early 1958 finally achieved full power as Communist Party leader and Premier in the Kremlin. Bolstered by the worldwide success of the Sputnik project, he was overconfident of Soviet military superiority. He was annoyed that the U.S. was locating nuclear missiles at American bases in West Germany and wanted bargaining leverage to reverse that threat. Although critics worried about his tendency to recklessness, he decided to announce decisive actions that would finally resolve the German situation.
Khrushchev sought to find a lasting solution to the problem of a divided Germany and of the enclave of West Berlin deep within East German territory. In November 1958, calling West Berlin a "malignant tumor", he gave the United States, United Kingdom and France six months to conclude a peace treaty with both German states and the Soviet Union. If one was not signed, Khrushchev stated, the Soviet Union would conclude a peace treaty with East Germany. This would leave East Germany, which was not a party to treaties giving the Western Powers access to Berlin, in control of the routes to the city. This ultimatum caused dissent among the Western Allies, who were reluctant to go to war over the issue. Khrushchev, however, repeatedly extended the deadline.
In November 1958, Khrushchev issued the Western powers an ultimatum to withdraw from Berlin within six months and make it a free, demilitarised city. Khrushchev declared that, at the end of that period, the Soviet Union would turn over control of all lines of communication with West Berlin to East Germany, meaning the western powers would have access to West Berlin only when East Germany permitted it. In response, the United States, United Kingdom, and France clearly expressed their strong determination to remain in, and maintain their legal right of free access to, West Berlin.
With tensions mounting, the United States, United Kingdom and France formed a covert group with orders to plan for an eventual response to any aggression on West Berlin. The planning group was named LIVE OAK, and staff from the three countries prepared land and air plans to guarantee access to and from West Berlin.
From the NATO perspective West Berlin--deep in Communist territory--had no military value. However it was the preeminent symbol of resistance to Soviet takeover of Europe. Eisenhower commented that Berlin was an, "instance in which our political posture requires us to assume military postures that are wholly illogical.” 
British Prime Minister Harold Macmillan went to Moscow for extended discussions with Khrushchev in February 1959. The meetings were mostly cordial; the ultimatum was dropped.
The Soviet Union withdrew its deadline in May 1959, and the foreign ministers of the four countries spent three months meeting. They did not come to any major agreements, but this process led to negotiations and to Khrushchev's September 1959 visit to the US, at the end of which he and US President Dwight Eisenhower jointly asserted that general disarmament was of utmost importance and that such issues as that of Berlin "should be settled, not by the application of force, but by peaceful means through negotiations."
Eisenhower and Khrushchev met at the US presidential retreat Camp David, where they talked frankly with each other. "There was nothing more inadvisable in this situation," said Eisenhower, "than to talk about ultimatums, since both sides knew very well what would happen if an ultimatum were to be implemented." Khrushchev responded that he did not understand how a peace treaty could be regarded by the American people as a "threat to peace". Eisenhower admitted that the situation in Berlin was "abnormal" and that "human affairs got very badly tangled at times." Khrushchev came away with the impression that a deal was possible over Berlin, and they agreed to continue the dialogue at a summit in Paris in May 1960. However, the Paris Summit that was to resolve the Berlin question was cancelled in the fallout from Gary Powers's failed U-2 spy flight on 1 May 1960.
- ^ McAdams 1993, p. 5
- ^ Loescher, 2001, p. 60
- ^ Dowty, 1989, p. 114.
- ^ Harrison, 2005, p. 98
- ^ Dowty, 1989, p. 121.
- ^ Paul Maddrell, Spying on Science: Western Intelligence in Divided Germany 1945–1961, p. 56. Oxford UP, 2006
- ^ Harrison, 2005, p. 99.
- ^ Dowty, 1989, p. 122.
- ^ Pearson, 1998. p. 75.
- ^ William Taubman, Khrushchev: the man and his era (2003), pp 364, 396-406
- ^ a b "Berlin Crisis". GlobalSecurity.org. Retrieved 23 September 2016.
- ^ "Code Name – LIVE OAK". North Atlantic Treaty Organization. Retrieved 24 September 2018.
- ^ Large, 2000, p 438–39.
- ^ Curtis Keeble, Britain and the Soviet Union, 1917–89 pp 258–60.
- ^ See Foreign Relations of the United States, 1958–1960, Volume X, Part 1 at 130. Memorandum of Conversation Camp David, September 26, 1959, 1 p.m.
- ^ William J. Thompson, Khrushchev (1995) pp 210–225.
- ^ Taubman (2003), pp 438, 490–492.