On May 22, 1933, Chinese and Japanese representatives met at Tanggu, Tianjin, to negotiate an end of the conflict. The resulting Tanggu Truce created a demilitarized zone extending one hundred kilometers south of the Great Wall, which the Chinese army was prohibited from entering, thus greatly reducing the territorial security of China proper, whereas the Japanese were permitted to use reconnaissance aircraft or ground units to make sure that the Chinese complied. Furthermore, the Chinese government was forced to acknowledge the de facto independence of Manchukuo and the loss of Rehe.