Pyongyang is establishing a blockade wall near the border and the military demarcation line, Yonhap said, citing two North Korean state media outlets.
North Korea is also taking steps in coastal areas to stop the virus entering via the sea, the Korean Central Broadcasting Station and the Korean Central News Agency reported.
"We are responding strongly to allow no room for the transmission of the virus through sea garbage," the broadcasting station said as cited by Yonhap.
Reclusive North Korea has so far not officially reported a single domestic coronavirus case but has reportedly stepped up health protection measures recently.
South Korea's NIS intelligence service said Kim has been pursuing "irrational measures" to deal with the pandemic, according to lawmakers briefed by the agency earlier this week.
NIS agents reported he has banned fishing and salt production for fear that saltwater is contaminated with the virus, in moves that are damaging to the country's already fragile economy.
They also reported that North Korean hackers have been targeting South Korean labs conducting vaccine research. - dpa
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