North Korean leader Kim Jong-un observed the successful test of an unspecified “newly developed ultramodern tactical weapon,” state media reported Friday, in an apparent bid to apply pressures on the United States and South Korea amid a stalemated nuclear diplomacy.

It didn’t appear to be a nuclear device or a long-range missiles targeting the mainland US, 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.