Japan has already discussed DPRK leader Kim Jong-il's death with U.S., South Korea, and Prime Minister Yoshihiko Noda urged officials to keep in touch with U.S., China, South Korea over the issue, according to Kyodo citing a senior government official.

DPRK top leader Kim Jong-il [File photo]

Noda also urged officials to make full preparations for contingencies while Foreign Minister Koichiro Gemba asked foreign ministry to prepare for any events after Kim's death, according to local reports.

Defense officials have been asked to be vigilant after Kim's death, repots said.