North Korean President Kim II Sung lanched a bitter attack yesterday on his South Korean counterpart and cancelled talks with Seoul scheduled for today at the cabinet level.

In an interview published by the Japanese newspaper Asahi, Kim said the talks ih Panmunjom could only serve to legitimize South Korea's new military ruler, Chun Doo Hwan.

"Chun Doo Hwan is more vicious than the late Park Chung Hee," said Kim in a reference to the South Korean president assassinated last October. k

The North Korean ruler said that the arrest of South Korean dissident Kim Dae Jung, sentenced to death earlier this month, shows Chun has "no intention" of unifying Korea. The talks at Panmunjom had been scheduled with that objective.

Kim renewed his call for a separate peace treaty with the United States and said he in turn would abrogate his current "cooperative agreements" with the Soviet Union and China.

North Korea's official news agency meanwhile accused the South Koreans of firing across the Demilitarized Zone for the third time in four days.

A report by Reuter news agency from Seoul, quoting authoritative South Korean sources, said Gen. Chun intends to abolish the present political parties under the terms of a constitution expected to be put in effect in October. Chun's intention is to end the old parties as vehicles for the personal ambitions of a few and to foster new groupings, the sources said.