Initially, Luns stood alone and was afraid that Franco-German co-operation would result in anti-Atlantic and anti-American policies that harmed the interests of the West. He made British membership of the European institutions conditional for his political co-operation. Gradually his views on Gaullist foreign policies were shared by the other EEC members and they joined Luns in his objections. Two of De Gaulle's decisions stiffened the opposition: his denial of EEC membership to the United Kingdom in January 1963 and France's retreat from the integrated military structure of NATO in 1966. Luns played a vital role in the negotiations unwinding French participation and continuing its political membership of the Alliance. By then, Luns had internationally established his reputation as an able and reliable negotiator and was seen as an important asset in London and Washington. After the retreat of De Gaulle in 1968, the EEC Summit of The Hague, in December 1969, ended the long crisis of the EEC integration process, opened the way to British membership and agreed on new venues for political co-operation, a common market and monetary union.