The Romanians of Bukovina declared union with the country on 28 November and those of Transylvania on 1 December. During the Paris Peace Conference, Brătianu did everything possible to secure Romania's new borders. Transylvania was the most important topic for him, so much so that he sent the Romanian army to Hungary despite the prohibitions from the Supreme Council of the Allied powers. The Romanian offensive was successful and the Hungarian Soviet Republic was disbanded on 1 August 1919. After severe diplomatic pressure, Romania signed the Treaty of Neuilly-sur-Seine with Bulgaria on 27 November (leaving the border the same) and the Treaty of Saint-Germain-en-Laye with Austria and treaties regarding ethnic minorities on 9 December 1919. Romania did not receive all of Banat, but two thirds, almost everything else going to Kingdom of Serbs, Croats and Slovenes. The Treaty of Trianon signed on 4 June 1920 defined the border between Romania and Hungary, the former receiving all of Transylvania and other lands in eastern Hungary (parts of Crișana and Maramureș). Romanian diplomats had also claimed the island of Ada Kaleh to protect the port of Orșova, and Romania received it after the signing of the treaty. This was confirmed by Turkey in 1923 in the Treaty of Lausanne. Finally, the Supreme Council recognized Bessarabia's union with Romania without detailing too much, since it would leave the issue for negotiations between Romania and Russia. By the end of 1920, the Romanian borders were settled. Romania gained (making a total area of ) and 8,500,000 inhabitants (with a total of 16,250,000). The Romanian national ideal was fulfilled, thus appearing Greater Romania.