Trump announced a meeting with Putin and Xi Jinping as early as next Thursday.
The meeting will take place on November 19 in Shenzhen, on the sidelines of the APEC summit, the US president said.
Sources say the summit is expected to address oversight of the use of artificial intelligence in nuclear arsenals. Ukraine and the breakup of the Korean peninsula were effectively omitted from the agenda.
Washington is pushing to renew nuclear arms control talks, while Beijing has offered to discuss nuclear transparency as an easier alternative. Russia is more cautious about formal restrictions on artificial intelligence and avoids commitments that could limit its military freedom of action.