Relations between North and South Korea remain tense a day after Pyongyang threatened to restart military exercises in the demilitarized zone bordering South Korea.

Citing the army, state media reported that troops would be sent to the industrial park in the border town of Kaesong and to the Kumgang Mountains on the east coast.

Guard posts in the demilitarized buffer zone between the two countries will be reestablished, it added. Tensions on the Korean peninsula hit a new low Tuesday when Pyongyang blew up its joint liaison office with Seoul.

Kim Yo Jong, the powerful sister of North Korean leader Kim Jong Un, called out the South for making a "tactless and sinister proposal" in its offer to send an envoy, according to a statement reported by North Korean news agency KCNA. Up until a year ago, the two had been making steps towards a more peaceful co-existence - there's little sign of any of that now.

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