Aren’t hypersonic missiles just ICBMs? Unless ramjets are a real thing. Dunno.
A hypersonic missile is not an ICBM.
Hypersonic missiles may have a much shorter range and are generally under power for the entire flight. Some Hypersonics may use Ramjet engines.
Hypersonic missiles are meant to be able to maneuver at high speeds to make interception by anti-missile batteries (like the Patriot) ineffective. Their high speed makes response time minimal. Ballistic missiles follow an arching path, which is relatively easy to track and defend if you have the technology. Cruise missiles fly extremely low and slow, and depend on terrain avoidance maneuvers to avoid radar. The US has developed, and is starting to deploy directed energy weapons (lasers) to counter hypersonic missiles. We already have some in the field being tested on ships, and on vehicle sized platforms. The challenge is to shrink the size and control the heat, but we have supposedly overcome that by operating several lasers in tandem on a sort of daisy chain so that each smaller laser dissipates heat much better than one large laser.