Canada also maintained diplomatic and economic ties with Cuba following the Cuban Revolution. Prior to the Cuban Missile Crisis, the insistence on a much more placated policy towards the Cuban government had been a source of contention between the United States and Canada. Prime Minister Diefenbaker firmly stood by his policy decision, insisting that this was the result of the rights of states to establish their own forms of government, rejection of current US interpretation of the Monroe Doctrine as well as Canada's right to establish its own foreign policy. Concern in the Canadian government was focused primarily on nuclear weapons, many politicians in the opposition and in power believed that as long as the US president retained absolute control of the nuclear weapons, Canadian forces could be ordered to undertake nuclear missions for the US without Canadian consent. During the Cuban Missile Crisis, Canada was expected to fall in line with American foreign policy, in that Canada's military forces were expected to go on immediate war alert status. Diefenbaker however, refused to do so emphasizing the need for United Nations intervention. It would only be after a tense phone call between President John F. Kennedy and Diefenbaker that Canada's armed forces would begin preparations for "immediate enemy attack". Although the crisis would eventually be solved by diplomatic talks between Nikita Khrushchev and Kennedy, nothing would loom larger over the Canadian state in the months following the crisis than the governing party's disarray on the question of nuclear arms.