The Democratic People's Republic of Korea (DPRK) threatened Tuesday to start "military demonstration" in response to South Korea's hostility, said the official Korean Central News Agency (KCNA).

"We will start military demonstration to defend our supreme dignity," the KCNA quoted an ultimatum issued by the Korean People 's Army's supreme command, and condemned anti-DPRK gatherings in Seoul as Pyongyang was celebrating Kim Il-sungs birthday anniversary.

The ultimatum added that "if Seoul really intends to conduct a dialogue, it should drop its confrontational attitude and apologize for its past crimes."

A spokesperson for the DPRK's Committee for the Peaceful Reunification of Korea said Sunday that South Korea's proposals for dialogue are not only insincere, but actually an insult to Pyongyang.

Earlier this week, South Korean President Park Geun-hye and Unification Minister Ryoo Kihl-jae separately urged Pyongyang to enter talks.

South Korea's defense chief said Monday that DPRK is seen ready to launch missiles, but he noted that there are no signs of a full-scale war.