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.”

The hotline a dedicated telephone link between the two militaries was used mainly to arrange for South Koreans, who work at an industrial complex in the North to cross the heavily armed border. When the connection was last severed in 2009, some workers were stranded in the North.

Normal direct telephone communications do not exist between the two countries.

The shutdown of the hotline 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 February 12 nuclear test.

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

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

Outside North Korea, Pyongyang’s actions are seen in part as an effort to spur dormant diplomatic talks to wrest outside aid, and to strengthen internal loyalty to young leader Kim Jong Un and build up his military credentials.

North Korea’s action was announced in a message that its chief delegate to inter-Korean military talks sent to his South Korean counterpart.

“Under the situation where a war may break out any moment, there is no need to keep North-South military communications,” he said. “North-South military communications will be cut off.”

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