"We'd certainly want to include China at some point," Trump told reporters.
"That would be a great thing for the world," he added, hours after his administration formally pulled out of the 1987 Intermediate-Range Nuclear Forces (INF) treaty.
US, Russia rip up Cold War-era INF missile treaty
Trump said he has talked about a new arms reduction treaty with both countries. China was "very excited... and so was Russia," he said.
"A pact where they reduce and we reduce nuclear, that would be a great thing for the world. I do believe that would happen."
The United States on Friday abandoned the INF treaty with Russia, saying that violations by Moscow had rendered it pointless.
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