Earlier this month, the leaders of the two countries met in Pyongyang for talks that centred on the stalled denuclearisation negotiations.
Nuclear diplomacy later stalled due to suspicions over how honest North Korea is about its disarmament pledge, but US Secretary of State Mike Pompeo is to visit Pyongyang this month to set up a second summit between US president Donald Trump and North Korean leader Kim Jong Un.
Experts believe the South Korean and U.S. militaries had planted about 1 to 1.2 million landmines south of the DMZ, which measures 250 kilometers in length and 4 kilometers in width.
"But, if the United States doesn't want the end of war, the DPRK will also not particularly hope for it", it added, using the acronym of North Korea's official name, the Democratic People's Republic of Korea.
"Now that the DPRK and the US are aspiring after the establishment of new relations true to the spirit of the June 12 DPRK-US joint statement, it is quite right to put an end to the belligerent relations between them", the Korean Central News Agency said in an English commentary.
A spokesman said the operation had begun on both sides, though this was not confirmed by the North.
South Korea would find itself more vulnerable to North Korean infiltration and assault via land routes, while North Korea would worry about front-line soldiers and residents escaping to the South more easily, Lee said.
Many foreign experts say North Korea are likely running additional secret uranium-enrichment plants.
Krishna Kapoor, wife of filmmaker Raj Kapoor, passes away
Om Shanti", Anupam Kher wrote on the microblogging site. "My deepest condolences to the family", Soha Ali Khan posted on Twitter. Bollywood celebrities are thronging to Chembur to pay their last respects to late Raj Kapoor's wife, Krishna Raj Kapoor.
A top South Korean official told lawmakers that North Korea is estimated to have up to 60 nuclear weapons, in Seoul's first public comment about the size of the North's secrecy-clouded weapons arsenal. A 2015 DMZ mine explosion blamed on North Korea that maimed two South Korean soldiers pushed the rivals to the brink of an armed conflict.
At Panmunjom, the Koreas are to spend 20 days clearing mines before withdrawing troops, weapons and guard posts in the area over the next five days.
They also reportedly dismantled propaganda, loudspeakers and some guard posts along the militarized border.
During the war, an outnumbered French battalion belonging to the American-led U.N. Command repelled a series of Chinese attacks in the area in October 1952, months before a South Korean army division also turned back similar Chinese assaults.
Meanwhile, on Monday, South Korea held a ceremony marking the recent return of remains of 64 South Korean soldiers missing from the Korean War.
According to South Korean officials, the number of North Korean defectors to the South has fallen since Mr Kim came to power seven years ago.
The nuclear diplomacy later came to a standstill amid disputes over how honest North Korea is about disarmament.