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The objective of this research is to measure the impact of the Spanish Civil War on the attitude of the French Popular Front about the collaboration with Soviet Union from 1936 to 1937. It takes shape in a political and journalistic opinion study based on a survey of three French daily newspapers attached to the Popular Front during the 1930s, namely L’Humanité, Le Populaire and L’Œuvre. The analysis is articulated through the events of 1936 to 1937 such as the ratification of the Franco-Soviet mutual assistance pact, the election of the Popular Front and the outbreak of the Spanish Civil War. The impact of the conflict in Spain is in fact measured in the intensification of the political polarization in France which influence the attitude of de Popular Front about the collaboration with Soviet Union. Despite the advent of a new Popular Front government, the outbreak of the Spanish Civil War elevated the political polarization between the left and the right in France, which started in 1934, at its peak. Without a strong coalition between the left and the center right, collective security led by the USSR could not succeed. While some journalists are tempted by the appeasement policy, others develop a more clear-sighted and realistic vision of the threat posed by Nazi Germany and the importance of a close Franco-Soviet relationship.