MOSCOW, June 10 -- For two days next week, Vladimir Putin will barely leave the negotiating table.

Kremlin spokesman Dmitry Peskov disclosed on Wednesday that the Russian president has a dense schedule of one-on-one meetings packed around the Russia-ASEAN commemorative summit in Kazan on June 18, calling it a "marathon" for Putin across both summit days. The full roster of bilateral partners, Peskov told reporters, would be announced in the coming days.

The description matters because it is the first confirmation from Moscow of the scale of individual diplomacy planned around what is officially billed as an anniversary gathering - thirty years since Russia and the Association of Southeast Asian Nations established their dialogue partner...