"Since the US granted Japan the right to reprocess spent fuel through the nuclear agreement in 1988, Japan has been pushing to stock up on plutonium for nuclear armament over the last 30 years," the committee said in the white paper.

"The amount of plutonium that has so far been accumulated is 518 tons, and of them, Japan possesses 47 tons. ... With 47 tons of plutonium, (it) can produce some 7,800 nuclear bombs that are the same as the one that was dropped in Nagasaki (in 1945)," it added.

The committee, then, berated Washington for its "dual" stance.

"(The US) is encouraging (Japan's) nuclear armament by automatically extending the nuclear pact, while it calls on us to take more trustable (denuclearization) measures or raises suspicion about (our) denuclearization (efforts)," it said.

The criticism came as Washington reportedly is pushing Pyongyang to take tangible denuclearization steps, such as a full declaration of its nuclear and missile programs, while the communist regime demands that the US agree first to the declaration of a formal end to the 1950-53 Korean War so as to help ensure the security of its regime.

During the historic June summit between US President Donald Trump and North Korean leader Kim Jong-un, the two sides agreed to pursue the "complete denuclearization" of the peninsula without specifics on the timeline and methods for the North's nuclear disarmament. (Yonhap)