President Donald Trump unveiled a revamped U.S. missile defense strategy on Thursday that called North Korea an ongoing and "extraordinary threat," seven months after he declared the threat posed by Pyongyang had been eliminated.

The Missile Defense Review, which also detailed concerns about the burgeoning capabilities of Iran, Russia and China, was a broad examination of efforts to shield the United States from enemy missiles, including a push to develop space-based sensors and study the development of space-based weapons.

"Our goal is simple: To ensure we can detect and destroy any missile launched against the United States — anywhere, anytime, anyplace," Trump said at the Pentagon as he unveiled the report.