Milley said he did not expect China would take military action against the island in the next 24 months.

But, when asked if the Pentagon could defend Taiwan, he replied that there was no question about it.

He told the Aspen Security Forum that the United States maintains a policy of "strategic ambiguity" about its stance on protecting Taiwan, and that it would be a presidential decision on whether to step in if China sought to seize control of the island.

"We absolutely have the capability to do all kinds of things around the world, to include that if required," Milley said. "We absolutely have the capability. There's no question about that."

Milley said he did not foresee Beijing, which views Taiwan as a renegade province, making any moves against the island in the near future, which he defined as up to 24 months.

"Having said that, though, the Chinese are clearly and unambiguously building the capability to provide those options to the national leadership if they so choose at some point in the future," he said.

He added that the United States believes the differences between China and Taiwan should be resolved peacefully based on the will of the people on both sides.

"We are just interested in a peaceful outcome," Milley said.