But the report said he would watch US actions before making a decision on "the enveloping fire at Guam".
Last week, North Korea warned that a plan was being drawn up to fire four missiles into the sea off Guam, where US bombers are based.
There has been a sharp escalation in rhetoric between the US and the North.
What does North Korea's statement really mean?
The report on state news agency KCNA said Kim Jong-un "examined the plan for a long time" and discussed it with senior military officials.
