As Prime Minister Following his return to Japan, Katō was appointed 21st Prime Minister of Japan in recognition of his performance at the Washington Naval Conference. His cabinet consisted mainly of bureaucrats and members of the House of Peers, which proved unpopular with the Imperial Japanese Army. During his tenure as prime minister, Katō implemented the provisions of the Washington Naval Agreement, withdrew Japanese forces from Shandong in China and ended Japanese participation in the Siberian Intervention.
As Prime Minister Following his return to Japan, Katō was appointed 21st Prime Minister of Japan in recognition of his performance at the Washington Naval Conference. His cabinet consisted mainly of bureaucrats and members of the House of Peers, which proved unpopular with the Imperial Japanese Army. During his tenure as prime minister, Katō implemented the provisions of the Washington Naval Agreement withdrew Japanese forces from Shandong in China and ended Japanese participation in the Siberian Intervention.