North Korean leader Kim Jong Un has reiterated that the country does not rule out using nuclear weapons if its enemies attempt to use force against it.

North Korea's ruling Workers' Party newspaper, Rodong Sinmun, reported on Tuesday that Kim gave a speech at Kim Jong Un University of National Defence the day before. The university marks the 60th anniversary of its founding this year.

Kim repeated his criticism of South Korean President Yoon Suk-yeol, saying that a wise politician would engage in managing the situation to prevent an armed clash with a nuclear state, rather than seeking confrontation or direct conflict.

Referring to South Korea, Kim said North Korea previously talked about unification by force, but now has no interest in that.

Pyongyang earlier said the Supreme People's Assembly was due to meet on Monday. However, state media has yet to cover what was discussed in the meeting.

South Korean media reported that the parliament may still be in session on Tuesday, as important agenda items, including defining South Korea as the "No.1 hostile country" in the constitution, are scheduled to be discussed.