Kim Jong Un has been formally named head of state of North Korea and commander-in-chief of the military in a new constitution that observers said was possibly aimed at preparing for a peace treaty with the United States.

North Korea has also long called for a peace deal with the United States to normalize relations and end the technical state of war that has existed since the 1950-1953 Korean War concluded with an armistice rather than a peace treaty.

The new constitution, unveiled on the Naenara state portal site on Thursday, said that Kim as chairman of the State Affairs Commission (SAC), a top governing body created in 2016, was "the supreme representative of all the Korean people", which means head of state, and "commander-in-chief".