What was the international conference that focused on naval disarmament and pacific security that led to the five power naval treaty?

There were three treaties signed at the Washington Naval Conference (1922), also called the Washington Disarmament Conference. The Five-Power Treaty was also known as the Washington Treaty for Naval Disarmament or simply the Washington Naval Treaty.

The conference was called by US President Warren G. Harding to address the arms race among European and Asian powers. There were invited representatives from the US, Japan, China, France, Britain, Italy, Belgium, the Netherlands, and Portugal. The Soviet Union (Russia) was not included.

The conference ended with three treaties: the Four-Power, Five-Power, and Nine-Power treaties. Among other things, they restricted some signatory nations to limits on the size and number of battleships, and led to new agreements on the status of China. There were follow-on treaties from the London Naval Conference (1930). Japan observed the treaties until 1936, after which it invaded China in 1937. The Nine-Power Conference in Brussels (1937) unsuccessfully tried to end that conflict.