"There are security issues," Putin said. "We have two naval bases in Vladivostok, from where our ships go out to the Pacific....We'd like the Japanese side to take all these concerns into account."

"It would be naive to think we can solve this problem in an hour," Putin said, adding that the isles row can not be solved soon.

Abe, who has been eager to make a breakthrough to the issue, brought down his tune Friday, saying that "concluding a peace treaty that has not been concluded in more than 70 years is not easy," though still vowing continued efforts to push forward the issue.

The two sides stressed that joint activities on the disputed islands will be held "under a special framework" so that it won't "infringe on the sovereignty positions of either side," and consultations on such a framework will be launched.

The lack of progress has caused disappointment and dissatisfaction among many Japanese whose hopes for solving the territorial issue has been boosted by Abe's show of determination earlier.

Toshihiro Nikai, secretary general of the ruling Liberal Democratic Party, has been quoted by the Kyodo News as saying that most people were disappointed and the party shouldn't be "pleased with this level of things."

"Japan has regarded it as an opportunity to solve the territorial disputes on the four Pacific islands. But Putin did not cave in. Japan gained nothing in this aspect," said Ling Xingguang, emeritus professor of Fukui Prefectural University.

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