"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.

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.