In 1928, Prussian "Ministerpräsident" Otto Braun said that he was not interested in becoming chancellor. When the SPD turned out to be the clear winner of the May 1928 elections, the Social Democrats thus designated Müller as chancellor. However, the other parties proved reluctant to compromise and it took a personal intervention by Stresemann for a government to be formed on 28 June 1928. The coalition—of Social Democrats, Zentrum, DDP and DVP—only managed to settle on a written agreement on the government's policies in spring 1929. In particular domestic policy differences between SPD and DVP dominated the government's work. Its continued existence was mainly due to the mutual personal esteem in which Müller and Foreign minister Stresemann held each other. Relations between the parties were strained by the arguments over "Panzerkreuzer A" (construction of a battleship), during which the SPD forced its ministers to vote against the allocation of funds to the project in the Reichstag although they had endorsed it in cabinet meetings. In addition, the "Ruhreisenstreit" was a bone of contention, as the DVP refused to provide financial support even to those only indirectly affected by the strike. Financing the budget 1929 and the external liabilities of the Reich was a huge problem, and an agreement was only possible by counting on negotiating more lenient conditions with the Allies. Müller himself had been the leader of the delegation to the League of Nations in the summer of 1928 where he—despite a heated argument with French Foreign Minister Aristide Briand over German rearmament—had laid the groundwork for concessions by the Allies. By January 1930, the government had succeeded in negotiating a reduction in reparation payments (the Young Plan signed in August 1929) and a promise by the Allies to completely remove the occupation forces from the Rhineland by May 1930.