With no progress reported in North Korea's investigation into the fates of Japanese nationals it abducted decades ago, Tokyo is stepping up calls on Pyongyang to declare its findings "promptly and honestly."

As of Friday, Japan had yet to receive a report about the 12 Japanese who Tokyo recognizes as abduction victims still missing — one year after Japan and North Korea announced a deal to get Pyongyang to "reinvestigate" what happened in return for the lifting of some unilateral sanctions.

The agreement set a deadline of this summer, although no date was specified.