With financial support from the governments of Sweden and Germany, he led, between 1927 and 1935, an international and interdisciplinary Sino-Swedish Expedition to carry out scientific investigations in Mongolia and Chinese Turkestan, with the participation of 37 scientists from six countries. Despite Chinese counter-demonstrations and after months of negotiations in China, was he able to make the expedition also a Chinese one by obtaining Chinese research commissions and the participation of Chinese scientists. He also concluded a contract which guaranteed freedom of travel for this expedition which, because of its arms, 300 camels, and activities in a war theater, resembled an invading army. However, the financing remained Hedin's private responsibility.