TOKYO - Japan has already discussed the top leader of the?Democratic People's Republic of Korea (DPRK) Kim Jong-il's death with US, the Republic of Korea (ROK), and Prime Minister Yoshihiko Noda urged officials to keep in touch with US, China, ROK over the issue, according to Kyodo citing a senior government official.

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.