Kerry's first visit to Japan as secretary of state came one day before the 101st anniversary of the birth of North Korean founder Kim Il Sung.
Kerry and Japanese Foreign Minister Fumio Kishida were expected to send a strong message to North Korea not to test-fire a ballistic missile, the Kyodo News agency quoted unnamed officials as saying.
The two also met in London on Wednesday, when they confirmed plans for cooperation in the face of North Korean threats against the US and its allies.
Kerry is scheduled to meet with Japanese Prime Minister Shinzo Abeon Monday.
On Saturday, Kerry said in China that Beijing and Washington share the goal of negotiating the denuclearization of the Korean Peninsula and urge North Korea to return to international talks.
"We say to Kim (Jong Un) and the people of the DPRK (Democratic People's Republic of Korea) that they have an obvious choice to join us to find a negotiated solution," Kerry said after talks with Chinese leaders.
On Friday in Seoul, Kerry warned North Korea that it would be a"huge mistake" to test-fire a missile and said the isolated communist state "will not be accepted as a nuclear power."//DPA