The effect of foreign aid was telling. Soviet aid, organized by the Comintern (Soviet agency to promote worldwide Communism,) was purchased by Loyalist gold. The International Brigades were ill equipped and poorly trained, and only 250 Soviet flyers joined in combat. At first, their I-15 Polipokarov monoplanes easily bested the Condor Legions Henschel Hs-123 biplanes. Hitler sent the new Messerschmitt Bf-109E, an all-metal, streamlined monoplane, and the Condor Legion found they had a potent weapon in their hands. In 1937 the United States applied the Neutrality Act to Spain, cutting off sales to both sides.
The Loyalists also spent as much time fighting each other as they did the Fascists, and this blunted their efforts. In 1939, Franco eliminated his opposition, and declared himself Generalissimo of Spain.
Franco clearly supported the Axis. The Blue Division of Spanish Regular Army troops was sent to the Soviet Union to fight for the extermination of Communism. Franco allowed tankers to refuel U-boats, and rallies agitated for the return of Gibraltar and French Morocco to Spain. German spies were not impeded.
Hitler and Franco met to discuss Spains entry into the war on Germanys side in 1940. Franco demurred, saying Spain was not prepared to fight. As the fortunes of war changed for Germany, Spain tried to appear as an Ally, severing diplomatic ties with Japan in April 1945. But at Potsdam the victorious Allies decreed that Spain could not be a founding member of the United Nations, denying entry until 1955.
Franco, a shrewd politician and dictator, stayed in power in Spain until his death in 1975, longer than any other political leader of World War II. Only Japanese Emperor Hirohito lived longer.