"We are talking about a system that is able to defend the capital city, and handle a mass of 200 and 300 mm rockets aimed at it."
North Korea has been subjected to UN sanctions since 2006 over its nuclear and ballistic missile programs.
Why does Benjamin Netanyahu think so ill of the media here?
In its first ever sanctions related to cybercrime, the EU targeted the department for special technologies of the Russian military intelligence service.
North Korea did not immediately react to the report but it has previously called criticism over its human rights record a "plot to overthrow" its regime.
"Thanks to our reliable and effective self-defensive nuclear deterrent, there will no longer be war, and our country's safety and future will be firmly guaranteed forever."
North Korea's state media only described the suspected patient as a person who had "run away" to South Korea three years ago before returning to the North.
If confirmed, it would be the first case officially acknowledged by North Korean authorities.
Kim Yo Jong, the sister of North Korea's leader, came a day after the US point man for North Korea, Deputy Secretary of State Stephen Biegun, wrapped up a three-day visit to Seoul.
"We do not feel any need to sit face to face with the US, as it does not consider the DPRK-US dialogue as nothing more than a tool for grappling its political crisis," the FM said.