He also accused South Korea of a "double-dealing attitude" in continuing to carry
out military drills with the U.S. and buying advanced military equipment.
"Bearing in mind our firm will to safeguard peace in the region, the United States and the South Korean authorities must refrain from any actions disrupting the stability of the situation and come up with a new way for solving the problem," Kim said.
North Korea has conducted missile tests in recent months, including that of a submarine-launched ballistic missile, and broke off the latest working-level nuclear talks with the U.S. in early October.
Pyongyang's top negotiator for the talks blamed the U.S. for the breakdown and said Washington "brought nothing" to the negotiating table.
Pyongyang has so far stuck to a freeze in testing of nuclear weapons and intercontinental ballistic missiles that has been in place since 2017 and allowed for three meetings between its leader, Kim Jong Un, and U.S. President Donald Trump since last year.
North Korean state media reported last week on Kim Jong Un's visit to Mt Paektu, the spiritual homeland of the Kim dynasty, and that his aides are convinced the leader plans "a great operation," which experts say may signal a major shift in Pyongyang's stance towards the U.S. in the coming months.
Some analysts say possible North Korean actions could include another space launch or an intercontinental ballistic missile test.