The Hypersonic Missile Gap

Russia and China are outpacing the United States in the development of super-fast missile technology, Pentagon officials and key lawmakers are warning.

First off, we've been here before.

Second, "turns immediately around" is a bit of hyperbole. A Mach 5 aircraft is going to have a humongous turning radius because they can't turn very quickly. At that speed, maneuverability is nearly negligible. If you can get a radar lock on the damned thing, it's a fire-control problem to get a anti-aircraft missile to hit it. You have to lead it enough.