U.S. Secretary of State Marco Rubio, right, addresses a joint press conference along with Australia's Foreign Minister Penny Wong, left, India's Foreign Minister Subrahmanyam Jaishankar, second from left, and Japan's Foreign minister Toshimitsu Motegi, second from right, following their Quad Foreign Ministers meeting at the Hyderabad House in New Delhi, May 26. AFP-YonhapNorth Korea on Thursday denounced a recent joint statement by the top diplomats of the United States, Australia, Japan and India that called for the North's complete denuclearization, reiterating that it will never abandon its nuclear weapons.The foreign ministers of the four nations, known as the U.S.-led multilateral security grouping of the Quad, reaffirmed their commitment to the "complete" denuclearization of North Korea in a joint statement issued Tuesday after their meeting in New Delhi.North Korea's foreign ministry said the Quad took issue with the North's legitimate exercise of sovereignty, claiming it is nothing but a political and diplomatic tool serving the realization of U.S. unipolar dominance."We once again say there will never, ever be any denuclearization of the DPRK," a spokesperson at the ministry said, using the acronym of North Korea's official name, the Democratic People's Republic of Korea.North Korea said it "flatly" rejects the U.S.-led Quad's hostile stance against Pyongyang while strongly calling on it to stop the pursuit of confrontation that undermines regional peace and stability.