North Korean leader Kim Jong-un, center, speaks to military officials at an unspecified national defense institute in this photo that appeared in the North's state newspaper Rodong Sinmun 's Friday edition. / Yonhap

North Korean leader Kim Jong Un observed the successful test of ''a newly developed ultramodern tactical weapon,'' the nation's state media reported Friday, though it didn't describe what sort of weapon it was.

It didn't appear to be a nuclear or missile-related test, a string of which last year had many fearing war before the North turned to engagement and diplomacy early this year. Still, any mention of weapons testing could influence the direction of currently stalled diplomacy between Washington and Pyongyang that's meant to rid the North of its nuclear weapons.

The North hasn't publicly tested any weapons since November of last year, but in recent days Pyongyang reportedly expressed anger at South Korea's resumption of small-scale military drills with the United States, and Friday's announcement could be in response to those drills.

Even if the test was a message for Washington and Seoul, Friday's report from the North was noticeably less belligerent than past announcements of weapons tests, and didn't focus on North Korean claims of U.S. and South Korean hostility.

It was the first publicly known field inspection of a weapons test by Kim Jong Un since he observed the testing of the Hwasong-15 intercontinental ballistic missile in November of last year, according to South Korea's Unification Ministry.

The North said the test took place at the Academy of National Defense Science and that Kim couldn't suppress his ''passionate joy'' at the success of the test. He was described as ''so excited to say that another great work was done by the defense scientists and munitions industrial workers to increase the defense capability of the country.''

The North said this new, unspecified weapon has been under development for a long time and will help strengthen the combat power of its army.

Last year's string of increasingly powerful weapons tests, many experts believe, put the North on the brink of a viable arsenal of nuclear-tipped missiles that can target anywhere in the mainland United States.

Diplomacy has stalled since a June summit between President Donald Trump and Kim in Singapore, with Washington pushing for more action on nuclear disarmament and the North insisting that the U.S. first approve a peace declaration formally ending the Korean War. Trump and Kim are both interested in another summit, but it's unclear when it might happen. (AP)

A captured image of Rodong Sinmun's article about Kim's inspection of a state weapon-developing center.