Japan's constitution allows it to possess nuclear weapons as long as they are kept to a minimum level necessary for self-defence, although the country has no intention of holding such arms, the government said in a statement Tuesday.

The statement, written in response to a question from an independent lawmaker, comes amid controversy over whether the country should debate holding nuclear arms an emotive issue in the only nation to have suffered nuclear attacks.

"From a purely legal standpoint, even Article Nine of the constitution does not bar our country from possessing minimum capabilities necessary for self-defence," the statement said, repeating a position the government has made clear in past parliamentary debate.

"Even with nuclear weapons, we've understood that possessing them would not necessarily violate the constitution as long as it is kept within such limits," it said.

But the statement said Japan would stick to its self-imposed "three non-nuclear principles" banning the possession, production and import of nuclear arms and that the government had no plans to debate a change in that stance.

It also said that Japan's basic law on atomic energy limits research, development and use of such power to peaceful purposes, while the country is bound under the nuclear Non-Proliferation Treaty not to receive or manufacture nuclear weapons.

Controversy over debate on nuclear arms erupted last month when Shoichi Nakagawa, the policy chief of the ruling Liberal Democratic Party, said Japan should discuss if it should acquire nuclear weapons after Pyongyang conducted a nuclear test.

Foreign Minister Taro Aso has also said debate should not be ruled out, prompting opposition lawmakers to call for his dismissal.

Four opposition parties called on Prime Minister Shinzo Abe to fire Aso for the second time in a week Tuesday, demanding that he respond in writing by today.

(China Daily November 15, 2006)