"It has become difficult for (the North) to sit down with Japan at the six-way talks as Japan acts without faith and morality," the North's Central Television Broadcasting Station said late Thursday, in a report monitored by South Korea's Yonhap news agency.

Japan is a member of the six-nation talks which also involve the two Koreas, the United States, China and Russia.

The talks aimed at persuading North Korea to halt its nuclear weapons drive have stalled after three rounds. Pyongyang boycotted a fourth session planned for September.

Tensions have increased between Japan and North Korea after the North last month handed over what it said were the remains of two Japanese kidnapped during the Cold War.

Japan says DNA tests proved the ashes are not those of the abductees and on Friday warned the North of a "serious response" unless it comes clean about the fate of 10 kidnap victims.

North Korea insists the remains are genuine and has asked for their return.

The TV station, the official broadcaster in the Stalinist state, accused Tokyo of fabricating the issue of human remains.

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