I voted yes, if we look at the European War of World War II in terms of a death match between Fascism/ National Socialism and Communism, the Spanish Civil War was World War Two.
The Soviet Union were the main suppliers of military aid to the Republican Army. This included 1,000 aircraft, 900 tanks, 1,500 artillery pieces, 300 armoured cars, 15,000 machine-guns, 30,000 automatic firearms, 30,000 mortars, 500,000 riles and 30,000 tons of ammunition.
The Soviets expected the Republicans to pay for these military supplies in gold. On the outbreak of the war Spain had the world’s fourth largest reserves of gold. During the war approximately $500 million, or two-thirds of Spain’s gold reserves, were shipped to the Soviet Union.
The Soviets also trained 14,000 international communist fighters for the Republicans cause.