As he didn’t dare to break up with the party-presidential system, Largo Caballero failed, and on May 17 M. Azaña charged a socialist J. Negrin focused on the closest cooperation with CPS with the formation of a new government. The political upheaval was prepared in spring 1937 not in favor of figures, but in favor of the communists block and the right wing of socialists. The social-liberal and communist politicians fixed upon Negrin as the most convenient compromise figure.
Emissaries of Comintern directly participated in such manipulations and were a force in a coalition of «May winners». It was obvious that the right socialists couldn’t have triumphed over Largo Caballero and the social revolution, if they hadn’t obtained communist support.
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Anti-fascists had more than one (external), at least two factors of resistance (which had been already proved by the defense of Madrid) — the revolution and assistance of the USSR. It was impossible to win at that conjuncture, having only one of them. The defeat resulted from not only the weakening of Soviet assistance, but of the revolution as well. Having paralyzed the revolution, the new Spanish government killed incentives of dedicated struggle for a victory. Largo Caballero could combine both such power sources of the Republic. Negrin gave up on one of them following which only the outbreak of the Second World War could save the Republic from ruin.
Up to 1938, the Soviet assistance counterbalanced the material and technical intervention of Germany and Italy, and the inter-brigades — partly the presence of the Italian military contingent. In the end of 1937 the Soviet assistance began to decline, while fascist assistance began to increase. The declining of the Soviet assistance was connected with disappointment of the Soviet government over inability of the new Negrin — Prieto government to achieve the promised breakdown in the war and complication of the international situation when the Spanish problem became less important in comparison with crises in China and Czechoslovakia.
From the second half of 1937 the Soviet assistance was provided to China as well, and the supplies to the East «were subtracted» from the supplies that the USSR could direct to Spain. China was more important yet for the USSR, than Spain — in fact this time the struggle was developed in immediate proximity from the Soviet borders. The peripheral containment of Japan was critical for the USSR during all the 1930s.
In spring-summer 1937 Republicans had an opportunity to recapture the initiative when Franco carried on a two-front war having concentrated forces in the North. Instead of focusing efforts on the victory and preparation of the offensive operation, the communists and social-liberals passionately struggled for power, and the Republic wasted time. In summer they conducted an operation angled towards their style, and it became clear that their methods were not better, but worse than Largo Caballero's war. In July-December, 1937 the chance to recapture the initiative was missed.