No. Normal ICBMs are already hypersonic weapons. Talking about "hypersonic weapons" is talking about gliding or maneuvering hypersonic warheads or cruise missi

No. Normal ICBMs are already hypersonic weapons. Talking about "hypersonic weapons" is talking about gliding or maneuvering hypersonic warheads or cruise missiles. (btw. Space Shuttle was hypersonic glider) China and Russia are developing hypersonic gliders to maintain their capability and create more variance. The US ballistic missile defense can't protect the US from Russia or China (nor it is intended to do), but it requires some adjustments. More ICBM's, warheads throw weight, and counter-countermeasures and different trajectories. For example, the fractional orbital bombardment that China tested is an old concept. Together with a gliding warhead, it means that China can maintain deterrence with fewer missiles.