Russia and China already possess thousands of weapons that could hit the U.S. homeland that the "Golden Dome" will ideally intercept once operational.

General Stephen Whiting tells Chicago forum that Beijing has spent three decades preparing to target US infrastructure.

Canadian Prime Minister Mark Carney says "high-level" talks are underway with the U.S. about potentially joining its proposed “Golden Dome” missile defence system. The initiative is designed to counter emerging threats.