LIVE OAK was the code name for a military planning group formed by the United States, United Kingdom, and France during the Cold War to plan for a response to any Soviet or Warsaw Pact aggression against West Berlin.
In November 1958, Soviet Premier Nikita Khrushchev issued an ultimatum to the three other Allied powers to withdraw from Berlin within six months and make it a free and demilitarised city, after that access to Berlin would be controlled by East Germany.
The Soviet Union withdrew the deadline before it passed in 1959 and engaged in negotiations with the other powers.
[1] The LIVE OAK staff, which was formed by the three countries during the crisis, prepared land and air plans to guarantee access to and from West Berlin.
[3] The planning group continued to operate during the Cold War until it was no longer necessary with the German reunification and the end of the Western Allied occupation of West Berlin.