Russia's presidential administration said a meeting of the American, Chinese and Russian leaders could take place during the APEC leaders' summit. No schedule or agreement has been announced.

If such a meeting were held, format and agenda would be the substance of it. Meetings held on the margins of multilateral summits usually run briefly on limited subjects and largely confirm what working-level talks have prepared.

The three countries carry different layers of business with one another. US-China matters center on trade and technology controls, US-Russia on the war in Ukraine and arms control, and China-Russia on energy and border cooperation.

The rarity of the trilateral format is itself notable. Leader-level meetings bringing all three together have been uncommon in recent international diplomacy.

APEC is a forum for economic cooperation. Security is not on its formal agenda, but a gathering of leaders customarily becomes a stage for bilateral and multilateral contacts.

Regional economies including Korea and Taiwan are sensitive to shifts among the three. Energy prices, semiconductor export controls and grain shipping routes all sit inside that web.

What is confirmed so far is the Russian remark alone. Neither Washington nor Beijing has made its position public, and this paper does not treat the meeting as settled.