South Korea’s Unification Ministry said Monday that North Korea failed to respond for a fourth straight day to regularly held calls on an inter-Korean liaison communications channel. The calls are normally held on weekdays at 9 a.m. and 5 p.m.

“We’re weighing the possibility of a unilateral cut-off” by Pyongyang, spokesman Koo Byoung-sam told reporters at a news briefing. He added this is the first time since October 2021 that all inter-Korean military lines or liaison calls have been stopped for more than a day.

The two Koreas, which are technically still at war, don’t have regular phone service. They set up hotlines in 2018 after a series of summits aimed at decreasing tensions on their heavily armed border. But North Korea has previously shut the communications links in displays of anger.

“I believe it is a part of its political-diplomatic response, a way of expressing its strong disgruntlement against the U.S. and South Korea’s joint exercises,” said Go Myong-hyun, a senior fellow of the Asan Institute for Policy Studies.

“It’s unlikely a step toward escalation, but more of a tit-for-tat response against the joint military drills and much more elevated deterrence posture from South Korea and the U.S.,” Go said.

The U.S., Japan and South Korea this month held joint anti-submarine drills in waters off the South Korean island of Jeju. North Korea responded by warning that the U.S. and its “puppet state” allies were bringing grave danger to themselves and saying its nuclear arsenal was ready to be used at any time to deter the “war maniacs’ reckless moves.”

Kim Jong Un’s regime has pledged an unprecedented response to the drills and rolled out new weapons designed to deliver nuclear strikes against the U.S. and the two allies, which host the bulk of American troops in the region. That response also included a new undersea “Haeil” drone North Korea tested last month and this month that it said could deliver a “radioactive tsunami” — a claim doubted by South Korea’s military.

The inter-Korean hotline was restored in July 2021, after being cut by North Korea for about a year in protest against South Korean activists’ move to send leaflets critical of Kim’s regime across the border by balloon. A few weeks later the lines were cut again for about two months in a show of anger from Pyongyang over joint military drills.

In June 2022, North Korea did not respond to a regular hotline call, apparently due to technical glitches caused by heavy rains.

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