Japan said it feels "extremely" sorry for Iran's announcement that it has successfully produced 3.5 percent enriched uranium, Kyodo News reported Wednesday.

"It is extremely deplorable if it is true that Iran has succeeded in the enrichment as announced this time," Chief Cabinet Secretary Shinzo Abe said on Wednesday, "the action goes against messages of the U.N. Security Council, the International Atomic Energy Agency board and other parties concerned."

The top government spokesman reiterated Japan's intention to solve the Iranian nuclear issue with the international community, while maintaining its friendly relations with the country and the Azadegan oil development project there.

Iran on Tuesday declared that it has gained ticket to join global nuclear club by having successfully produced 3.5 percent enriched uranium, a technological leap in the process for nuclear power plant construction.

The announcement came after the U.N. Security Council adopted a presidential statement on March 29, urging Iran to completely halt nuclear development activities within 30 days, including the enrichment of uranium. The requirement has been rejected by Tehran as illegal.

Iran is the third largest supplier of crude oil for Japan. Tokyo is keen on playing a role in resolving the Iranian nuclear issue.