North Korea fired an ICBM but the US and Japan didn't do anything to intercept.

https://sg.news.yahoo.com/north-korea-fires-ballistic-missile-u-government-sources-192352938.html

The USA and Japan didn't intercept the ICBM fired by the North Korea.

Why?

This was because the ICBM flew beyond the altitudes of THAAD and other missiles defence system.