Explainer: Why didn’t Japan shoot down Pyongyang’s missiles?

So why didn’t Japan shoot down North Korean missile that recently flew directly over the country?

Over the years, the Japanese government has spent billions of dollars on a ballistic missile defence shield.

So why didn’t Japan shoot down the North Korean missile that recently flew directly over the country?

Al Jazeera’s Alex Gatopoulos explains.

By Alex Gatopoulos