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Antonescu-Sima partnership

The resulting regime, deemed the National Legionary State, was officially proclaimed on 14 September. On that date, the Iron Guard was remodelled into the only legally permitted party in Romania. Antonescu continued as Premier and Conducător, and was named as the Guard's honorary commander. Sima became Deputy Premier and leader of the Guard. Antonescu subsequently ordered the Guardists imprisoned by Carol to be set free. On 6 October, he presided over the Iron Guard's mass rally in Bucharest, one in a series of major celebratory and commemorative events organized by the movement during the late months of 1940. However, he tolerated the PNȚ and PNL's informal existence, allowing them to preserve much of their political support.

There followed a short-lived and always uneasy partnership between Antonescu and Sima. In late September, the new regime denounced all pacts, accords and diplomatic agreements signed under Carol, bringing the country into Germany's orbit while subverting its relationship with a former Balkan ally, the Kingdom of Yugoslavia. Germans troops entered the country in stages, in order to defend the local oil industry and help instruct their Romanian counterparts on Blitzkrieg tactics. On 23 November, Antonescu was in Berlin, where his signature sealed Romania's commitment to the main Axis instrument, the Tripartite Pact. Two days later, the country also adhered to the Nazi-led Anti-Comintern Pact. Other than these generic commitments, Romania had no treaty binding it to Germany, and the Romanian-German alliance functioned informally. Speaking in 1946, Antonescu claimed to have followed the pro-German path in continuation of earlier policies, and for fear of a Nazi protectorate in Romania.

During the National Legionary State period, earlier antisemitic legislation was upheld and strengthened, while the " Romanianization " of Jewish-owned enterprises became standard official practice. Immediately after coming into office, Antonescu himself expanded the anti-Jewish and Nuremberg law -inspired legislation passed by his predecessors Goga and Ion Gigurtu, while tens of new anti-Jewish regulations were passed in 1941–1942. This was done despite his formal pledge to Wilhelm Filderman and the Jewish Communities Federation that, unless engaged in "sabotage," "the Jewish population will not suffer." Antonescu did not reject the application of Legionary policies, but was offended by Sima's advocacy of paramilitarism and the Guard's frequent recourse to street violence. He drew much hostility from his partners by extending some protection to former dignitaries whom the Iron Guard had arrested. One early incident opposed Antonescu to the Guard's newspaper Buna Vestire, which accused him of leniency and was subsequently forced to change its editorial board. By then, the Legionary press was routinely claiming that he was obstructing revolution and aiming to take control of the Iron Guard, and that he had been transformed into a tool of Freemasonry (see Anti-Masonry). The political conflict coincided with major social challenges, including the influx of refugees from areas lost earlier in the year and a large-scale earthquake affecting Bucharest.

Disorder peaked in the last days of November 1940, when, after uncovering the circumstances of Codreanu's death, the fascist movement ordered retaliations against political figures previously associated with Carol, carrying out the Jilava Massacre, the assassinations of Nicolae Iorga and Virgil Madgearu, and several other acts of violence. As retaliation for this insubordination, Antonescu ordered the Army to resume control of the streets, unsuccessfully pressured Sima to have the assassins detained, ousted the Iron Guardist prefect of Bucharest Police Ștefan Zăvoianu, and ordered Legionary ministers to swear an oath to the Conducător. His condemnation of the killings was nevertheless limited and discreet, and, the same month, he joined Sima at a burial ceremony for Codreanu's newly discovered remains. The widening gap between the dictator and Sima's party resonated in Berlin. When, in December, Legionary Foreign Minister Mihail R. Sturdza obtained the replacement of Fabricius with Manfred Freiherr von Killinger, perceived as more sympathetic to the Iron Guard, Antonescu promptly took over leadership of the ministry, with the compliant diplomat Constantin Greceanu as his right hand. In Germany, such leaders of the Nazi Party as Heinrich Himmler, Baldur von Schirach and Joseph Goebbels threw their support behind the Legionaries, whereas Foreign Minister Joachim von Ribbentrop and the Wehrmacht stood by Antonescu. The latter group was concerned that any internal conflict would threaten Romania's oil industry, vital to the German war effort. The German leadership was by then secretly organizing Operation Barbarossa, the attack on the Soviet Union.