Hypersonic weapons were developed by the United States, Russia and China because at this point they were not only undetectable by radar but impossible to intercept. This makes it a weapon with quite powerful destructive power on the battlefield of the future. According to a South China Morning Post report, China announced the success of building a radar that can track 10 hypersonic weapons simultaneously.
In the same report, the radar is said to use photonic microwave technology. A hypersonic weapon flying at a speed of Mach 20 (~25,000 kmh) can be tracked from a distance of 600 kilometers with an accuracy of 99.7%. The actual design and picture of this radar has not yet been revealed.
Although radars that track hypersonic weapons have been developed, there is still no missile system that intercepts them before they reach their target. Because it travels at such high speeds, producing a deterrent system is nearly impossible using current technology. For example if a Mach 20 missile is detected from a distance of 600 kilometers, the defense system has only 90 seconds to destroy it.
So far only Russia has an operational hypersonic missile which is the Kh-47M2 Kinzhal and it has been used in Ukraine. Kinzhal is capable of flying at a maximum speed of Mach 10 (~12,000 kmh) and is equipped with conventional or nuclear warheads depending on the mission.