The Lansing–Ishii Agreement (石井・ランシング協定, Ishii-Ranshingu Kyōtei) was a diplomatic note signed in Washington between the United States and Imperial Japan on 2 November 1917 over their disputes with regards to China.
Both parties agreed to respect the independence and territorial integrity of China and to follow the principle of equal opportunity for commerce and industry in that country.
[2] In a secret protocol, which was attached to the public agreement, both parties agreed not to take advantage of the special opportunities presented by World War I to seek special rights or privileges in China at the expense of other nations that had been allied in the war effort against Germany.
However, critics soon realized that the vagueness and the differing possible interpretations of the agreement meant that nothing had really been decided after two months of talks.
For the Japanese, the Lansing–Ishii Agreement acknowledged Tokyo's special interests in part of China and recognized that Japan could not easily be ignored in international affairs.