This paper aims to expand our knowledge of a historical episode that not only dramatically affected the Middle East, but it also had a significant impact on North African countries. When the Arab-Israeli war broke out Algerian-Moroccan relations were already strained as a consequence of their border conflict, the ‘War of the Sands’ (1963), and the significant acquisition of Soviet arms by the Algerian regime that ensued. Then, as Algeria broke relations with the US and radicalized its position in relation to Arab policy towards Israel, Morocco grew further distrustful. King Hassan II therefore was compelled, on the one hand, to turn to Washington seeking further military assistance to compensate this arms imbalance; and, on the other hand, to work towards improving relations with other neighbors. This study results from analyzing Morocco’s policy reaction to these challenging developments from a three-party perspective and using diplomatic documentation from American (NARA-College Park, and Lyndon B. Johnson Library), and Spanish national archives (Ministry of Foreign Affairs Archive and Ministry of the Presidency Archive). It leads to two main conclusions. Firstly, that in its fundamentals President Johnson´s policy towards Morocco’s demands followed Kennedy’s previous path, which consisted in avoiding a major involvement of his government in support of this regional ally. The Johnson administration, in addition, encountered limitations in foreign aid established by Congress at the time. The US government finally was not able to provide a timely delivery of military assistance, and so King Hassan’s expectations were frustrated. Secondly, that such an unsatisfying US response to Morocco’s request was eventually beneficial for Spanish interests. As the King of Morocco felt insufficiently backed by the US, he resorted to ameliorating relations with neighboring regimes with whom outstanding territorial disputes still existed as a legacy of the colonial period. In particular, the negotiations of a fishing treaty favoring Spanish interests were facilitated, in compensation for the return of the enclave of Ifni to Morocco in 1969.