If the Norks are good at one thing, it’s saber rattling.

SEOUL, South Korea (AP) — Raising tensions with South Korea yet again, North Korea cut its last military hotline with Seoul on Wednesday, saying there was no need to continue military communications between the countries in a situation “where a war may break out at any moment.”

A senior North Korean military official informed the South that all military dialogue and communications channels would remain cut until South Korea halts its “hostile acts” against the North.

The hotline shutdown is the latest of many threats and provocative actions from North Korea, which is angry over U.S.-South Korean military drills and recent U.N. sanctions punishing it for its Feb. 12 nuclear test.

North Korea recently cut a Red Cross hotline with South Korea and another with the U.S.-led U.N. command at the border between the Koreas.

The link cut Wednesday had been essential in operating the last major symbol of inter-Korean cooperation: an industrial complex in the North that employs hundreds of workers from the South. It was used by the two countries’ militaries to arrange for workers and shipments to cross their heavily armed border.