Tokyo: Japan will lift some sanctions on North Korea including a ban on charter flights and travel after Pyongyang agreed to reinvestigate the fate of Japanese citizens abducted decades ago, Japan's top government spokesman said on Friday.

Talks on establishing diplomatic ties between the two wary neighbours have been blocked by the dispute over Japanese snatched by North Korean agents in the 1970s and 1980s to help train North Korean spies in language and customs.

The issue is a highly emotive one in Japan.

North Korea also agreed in talks this week in Beijing to cooperate in handing over a Japanese radical who took part in hijacking a Japan Airlines plane in 1970, forcing the airliner to land in Pyongyang, Chief Cabinet Secretary Nobutaka Machimura said.

"With these promises ... the process of resolving the abduction issue has resumed, and the government would like to have active talks with North Korea in order to achieve a comprehensive solution to the issues of the abductions and its nuclear and missile programmes," Machimura told a news conference.

North Korea's official KCNA news agency also said Pyongyang would reinvestigate the abduction issue.

Tokyo first imposed sanctions including a ban on imports and port calls by North Korean ships in October 2006 after North Korea conducted a nuclear test and test-launched ballistic missiles.

The sanctions were extended for six months from April. North Korean ships that wanted to carry humanitarian aid from Japan could also make port calls, although Tokyo was not considering providing such aid itself at this time, Machimura said.

But Tokyo would continue to refuse to take part in energy aid as part of a multilateral deal aimed at ending the secretive communist state's nuclear programme until the abduction dispute is resolved.