Japan is voicing alarm at the approach of a US-China-Russia summit, having raised its concerns with the Trump administration only to see the three leaders meet anyway, Kyodo News reported.
The government intends to keep cautioning Washington so the three-way rapprochement does not damage the security order Japan has built with the United States, a government source said.
The summit will be held alongside the Asia-Pacific Economic Cooperation (APEC) leaders' meeting in Shenzhen, China.
Prime Minister Sanae Takaichi plans to look for a chance to talk with President Trump during APEC and at the preceding ASEAN leaders' meetings in the Philippines.
A diplomatic source invoked the 1945 Yalta Conference, where the Allied powers carved up postwar spheres of influence, and said: "If the three countries behave like leaders of the international community, that is a threat to Japan."