North Korea to 'permanently' seal border, cut ground connections with South

North Korea has said it will permanently block its border with South Korea and boost its front-line defence posture to cope with “confrontational hysteria" by South Korean and US forces.

North Korea's military said on Wednesday it will “completely cut off roads and railways ” linked to South Korea and “fortify the relevant areas of our side with strong defence structures,” according to the North's official Korean Central News Agency.

The North's military called its steps a “self-defensive measure for inhibiting war and defending the security” of North Korea.

It said that “the hostile forces are getting ever more reckless in their confrontational hysteria.”

It cited what it called various war exercises in South Korea, the deployment of US strategic assets and its rivals' harsh rhetoric.

While the moves were likely a pressure tactic, it's unclear how they will affect ties with South Korea since cross-border travel and exchanges have been halted for years.

Front-line security

South Korean officials earlier said North Korea had already been adding anti-tank barriers and reinforcing roads on its side of the border since April in a likely attempt to boost its front-line security posture and prevent its soldiers and citizens from defecting to South Korea.

KCNA earlier Wednesday said the Supreme People’s Assembly met for two days this week to amend the legal ages of North Koreans for working and participating in elections.

But it didn't say whether the meeting dealt with leader Kim Jong-un's order in January to rewrite the constitution to remove the goal of peaceful Korean unification, formally designate South Korea as the country’s “invariable principal enemy” and define the North’s sovereign, territorial sphere.

Some experts say North Korea might have delayed the constitutional revision but others speculated it amended the constitution without announcing it because of its sensitivity.

Kim's order stunned many North Korean watchers because it was seen as breaking away from his predecessors' long-cherished dreams of achieving a unified Korea on the North's terms.

Experts say Kim likely aims to diminish South Korea’s voice in the regional nuclear standoff and seek direct dealings with the US.

They say Kim also likely hopes to diminish South Korean cultural influence and bolster his rule at home.