Throughout 1915–1916, German efforts to negotiate a separate peace with Japan failed. On 3 July 1916, Japan and Russia signed a treaty whereby each pledged not to make a separate peace with Germany, and agreed to consultation and common action should the territory or interests of each in China be threatened by an outside third party. Although Russia had a claim to Chinese territory by the Kyakhta and other treaties, Japan discouraged Russia from annexing Heilongjiang and began to slowly push the other powers out, such as the Germans in the Twenty-One Demands (1915). The delineating line between Russian (north) and Japanese (south) spheres of influences in China was the Chinese Eastern Railway.