North Korea's ruling Workers’ Party has revised its party rules to adopt the dual-track policy of simultaneously pursuing economic development and nuclear weapons.

The party’s mouthpiece, the Rodong Sinmun, said on Tuesday that the party adopted a written decision to revise the party rules at the seventh party congress to include the dual-track approach, also known as the "Byeongjin" policy.

At the party congress, North Korean leader Kim Jong-un announced that the policy is not a temporary measure to deal with the ever-changing international situation, but a strategic plan that his country should pursue permanently.

The North Korean Constitution stipulated in 2012 that the North is a nuclear state.