On 27 November 1958 another Berlin crisis broke out when Khrushchev submitted an ultimatum with a six-month expiry date to Washington, London and Paris, where he demanded that the Allies pull all their forces out of West Berlin and agree that West Berlin become a "free city", or else he would sign a separate peace treaty with East Germany. Adenauer was opposed to any sort of negotiations with the Soviets, arguing if only the West were to hang tough long enough, Khrushchev would back down. As the 27 May deadline approached, the crisis was defused by the British Prime Minister Harold Macmillan, who visited Moscow to meet with Khrushchev and managed to extend the deadline while not committing himself or the other Western powers to concessions. Adenauer believed Macmillan to be a spineless "appeaser", who had made a secret deal with Khrushchev at the expense of the Federal Republic.