"510 tonnes (16,000,000 ozt) of gold, corresponding to 72.6% of the total gold reserves of the Bank of Spain...... transferred from their original location in Madrid to the Soviet Union a few months after the outbreak of the Spanish Civil War."

"After the war ended with a Nationalist victory, General Francisco Franco's government repeatedly demanded the gold's return. The Soviet Union, however, spurned these claims, stating that the entire amount had been spent and that the Spanish government actually owed the USSR money for additional credit extended during the war."
google gemini, prompt: "did spain ever recover the gold they.moved to moscow?" (llmv)