Japan’s Air Self-Defence force held a practice drill using anti-ballistic patriot interceptors at a military base in Northern Japan.

The drill comes up as tensions increased in the region over North Korea’s repeated missiles test launches in recent months.

Earlier this month North Korea said it had conducted its first test of an intercontinental ballistic missile and that it had mastered the technology to mount a nuclear warhead on the missile.

Some experts say the test puts significant parts of the U.S. Mainland in range of an attack from North Korea, even if their ability to strike with any degree of accuracy is limited.

Japan’s military has been inviting media to several such drills since June in a bid to reassure Japanese citizens of the nation’s defense capacity.