Force officers known as the "Golden Square", seized power via a coup d'état and Rashid Ali proclaimed himself Chief of the "National Defence Government." The Golden Square deposed al-Hashimi and restored Rashid Ali. Ali did not overthrow the monarchy and named a new Regent to King Faisal II, Sherif Sharaf. The leaders of the "National Defence Government" proceeded to arrest many pro-British citizens and politicians but many escaped through Amman in Transjordan. The new regime planned to refuse further concessions to the United Kingdom, to retain diplomatic links with Fascist Italy and to expel the most prominent pro-British politicians. The plotters considered the United Kingdom to be weak and believed that its government would negotiate with their new government regardless of its legality. On 17 April, Rashid Ali, on behalf of the "National Defence Government" asked Germany for military assistance in the event of war with the British. Ali attempted to restrict British rights guaranteed under Article 5 of the 1930 Anglo-Iraqi Treaty, when he insisted that newly arrived British troops quickly be transported through Iraq and to Palestine. Before the coup, Rashid Ali's supporters had been informed that Germany would recognise the independence of Iraq from the British Empire. There had also been discussions on war material being sent to support the Iraqis and other Arab factions in fighting the British. On 3 May, German Foreign Minister Joachim von Ribbentrop persuaded Adolf Hitler to secretly return Dr. Fritz Grobba to Iraq to lead a diplomatic mission to channel support to the Rashid Ali regime but the British quickly learned of the German arrangements through intercepted Italian diplomatic transmissions. On 6 May, in accordance with the Paris Protocols, Germany concluded a deal with the Vichy French government to release war materials, including aircraft, from sealed stockpiles in the French Mandate of Syria and transport them to Iraq. The French also agreed to allow passage of other weapons and material and loaned several airbases in northern Syria to Germany, for the transport of German aircraft to Iraq. Between 9 May and the end of the month, about 100 German and about 20 Italian aircraft landed on Syrian airfields. On 30 April, the Iraqi Army surrounded and besieged RAF Habbaniya; the base had no operational aircraft but the RAF converted trainers to carry weapons and a battalion of infantry reinforcements was flown in. German and Italian aircraft supported the Iraqi army and