In the 1950s France sought American help in developing nuclear weapons; Eisenhower rejected the overtures for four reasons. Before 1958, he was troubled by the political instability of the French Fourth Republic and worried that it might use nuclear weapons in its colonial wars in Vietnam and Algeria. Charles de Gaulle brought stability to the Fifth Republic starting in 1958, but Eisenhower was still hesitant to assist in the nuclearization of France. De Gaulle wanted to challenge the Anglo-Saxon monopoly on Western weapons by having his own "Force de frappe." Eisenhower feared his grandiose plans to use the bombs to restore French grandeur would weaken NATO. Furthermore, Eisenhower wanted to discourage the proliferation of nuclear arms anywhere.