This was a pretty predictable response to the recently announced UN sanctions:
SEOUL, March 8 (Yonhap) — North Korea said Friday that it will sever its emergency hot line with Seoul and nullify non-aggression agreements between the two countries, amid escalating tensions over the North’s nuclear test last month.
“The DPRK abrogates all agreements on nonaggressions reached between the North and the South,” the North’s Committee for the Peaceful Reunification of Korea (CPRK), a propaganda organ against the South, said in an English statement carried by the North’s Korean Central News Agency (KCNA). “The DPRK close the Panmunjom liaison channel between the North and the South.” [Yonhap]
Do not be surprised if in the next few months they do something to test President Park Geun-hye along the NLL or DMZ.