to work with her, Marie Antoinette was not considered sincere in her cooperation with the moderate leaders of the French Revolution, which ultimately ended any chance to establish a moderate government. Moreover, the view that the unpopular queen was controlling the king further degraded the royal couple's standing with the people, which the Jacobins successfully exploited after their return from Varennes to advance their radical agenda to abolish the monarchy. This situation lasted until the spring of 1792. Marie Antoinette continued to hope that the military coalition of European kingdoms would succeed in crushing the Revolution. She counted most on the support of her Austrian family. After the death of her brother Joseph in 1790, his successor, Leopold, was willing to support her to a limited degree. Upon Leopold's death in 1792, his son, Francis, a conservative ruler, was ready to support the cause of the French royal couple more vigorously because he feared the consequences of the French Revolution and its ideas for the monarchies of Europe, particularly, for Austria's influence in the continent. Barnave had advised the Queen to call back Mercy, who had played such an important role in her life before the Revolution, but Mercy had been appointed to another foreign diplomatic position and could not return to France. At the end of 1791, ignoring the danger she faced, the Princesse de Lamballe, who was in London, returned to the Tuileries. As for Fersen, despite the strong restrictions imposed on the Queen, he was able to see her a final time in February 1792. Events leading to the abolition of the monarchy on 10 August 1792 Leopold's and Francis II's strong action on behalf of Marie Antoinette led to France's declaration of war on Austria on 20 April 1792. This resulted in the queen being viewed as an enemy, although she was personally against Austrian claims to French territories on European soil. That summer, the situation was compounded by multiple defeats of the French armies by the Austrians, in part because Marie Antoinette passed on military secrets to them. In addition, at the insistence of his wife, Louis XVI vetoed several measures that would have further restricted his power, earning the royal couple the nicknames "Monsieur Veto" and "Madame Veto", nicknames then prominently featured in different contexts, including La Carmagnole. Barnave remained the most important advisor and supporter of the queen, who was willing to work