[1] Serrano Suñer was known for his pro-Third Reich stance during World War II, when he supported the sending of the Blue Division to fight along with the Wehrmacht on the Russian front.

[4] Carmen Díez de Rivera e Icaza [es] was Ramón Serrano Suñer's illegitimate daughter by the Marquis of Llanzol's wife but he never recognized her.

She later became the Chief of Cabinet, ranking as Secretary of State, under Adolfo Suarez's right wing coalition and later as a socialist member of the European Parliament.

He escaped in October 1936, dressed as a woman, and was then helped by the Argentine navy in getting to France, from where he was able to reach Salamanca on 20 February 1937, where Franco was in office at the time.

In September 1940, the strongly pro-Axis Serrano Suñer visited Berlin to meet the German Foreign Minister Joachim von Ribbentrop to discuss how Spain might best enter the war on the Axis side.

[9] Franco, in his letters to Serrano Suñer, praised Hitler as a wise statesman and dismissed Ribbentrop's demands as the product of a man who failed to appreciate properly what Spain had to offer the Axis.

In June 1939, Serrano Suñer had been back to Italy to present Benito Mussolini with the thousands of repatriated Italian soldiers who had fought by the side of Franco in Spain against the Republicans.

Just one week after Serrano Suñer was promoted to Minister of Foreign Affairs, on 23 October 1940, Franco and Adolf Hitler met at the Hendaye railway station in France, near the Spanish border.

[11] Although Serrano Suñer had played a major role in establishing the Spanish state under Franco, being so influential as to be nicknamed the Cuñadísimo, which translates as supreme brother-in-law (a joke on "Generalísimo"), and despite Serrano Suñer's advocating Spain's joining the Axis powers, Franco opted for Spain to remain a nonbelligerent during World War II.

[12] However, it is unclear whether Gamero was working on his own initiative and Hitler was disappointed that Serrano Suñer had not tried harder to help Germany and called him the "gravedigger of the new Spain".

To make up for that failure, Serrano Suñer proposed the Blue Division of Spanish volunteers[13] to fight with the Germans against the Soviet Union after Operation Barbarossa, which started on 22 June 1941.

On 23 June, upon receiving the news, he met with Franco in El Pardo, and the Council of Ministers passed a resolution thereafter concerning the sending of a division of Spanish volunteers to the front.

In September 1942, following the Basilica of Begoña incident of August 1942, Serrano Suñer was forced to resign as foreign minister and president of the political council of the Falange Española Tradicionalista y de las JONS.

In 1949, Serrano Suñer sponsored the visit to Spain of British Fascist leader Oswald Mosley, taking him to the tomb of José Antonio Primo de Rivera.