Senior diplomats from Japan, South Korea and the United States plan to meet in Tokyo to work on resuming long-stalled six-party talks on North Korea's nuclear weapons program, sources say.

Relations between the United States and North Korea in particular appear to be at a low ebb after Washington accused Pyongyang of involvement in a costly cyberattack against Sony Pictures Entertainment Inc.

Chief Cabinet Secretary Yoshihide Suga said Wednesday the three nations are in the process of scheduling a meeting in Tokyo to discuss North Korea.