The DPRK refused to pick up the hotline in 2016 in retaliation to the closure of an industrial complex. The complex was jointly operated by the two sides and provided much-needed revenue to Pyongyang.

The most recent suspension of contact came in February 2016. It was the sixth time the hotline had been cut off since it was first established in 1971 in Panmunjom. In the past two years, relations have deteriorated as the DPRK has accelerated its nuclear and missile programs with more frequent tests. Pyongyang launched at least 20 missiles throughout 2016 and 2017. South Korea also conducted multiple rounds of military drills with the US.