North Korea’s latest test of a cluster warhead signals that the military is moving toward operational deployment of the weapon, according to experts, warning that their use on tactical missiles could put even the South Korean coastal city of Busan within reach.

The Korean Central News Agency (KCNA) reported Sunday that North Korea’s Missile Administration had tested a “Standard Type 2 cluster-bomb warhead” for tactical ballistic missiles, saying it could turn 12 to 13 hectares (about 30 to 32 acres) “into ashes” at its highest density.

It was the North’s third cluster warhead test this year, following two