The Chinese military resolutely opposes the US' accusation that China is conducting secretive nuclear experiments and sensitive biological research, calling the speculation completely unfounded and purely fabricated, Senior Colonel Tan Kefei, spokesman of the Ministry of National Defense, said on Thursday.

On April 15, the US Department of State released the 2023 Arms Control, Nonproliferation, and Disarmament Agreements and Commitments, which accused China of conducting secretive nuclear tests, sensitive biological activities and proliferation of missile technology.

Tan sad the content of the US report is "completely unfounded and purely fabricated" with the intention of deliberately smearing China. He said the US has adopted a double standard in terms of arms control, nonproliferation and disarmament to serve its own security interests.

"They have constantly shifted blame and withdrawn from treaties in the field of nuclear non-proliferation, obstructed negotiations on the verification protocol of the Biological Weapons Convention, and established hundreds of biological laboratories worldwide," Tan said.

Meanwhile, the US is also developing new types of nuclear warheads, cooperating with the United Kingdom and Australia in nuclear submarine programs, and advancing military plans in outer space and cyberspace, Tan said.

"These actions have seriously undermined global and regional strategic stability and have a significant impact on multilateral arms control, nonproliferation and disarmament processes," he said.

Tan added that China firmly upholds the international system with the United Nations at its core, as well as the international order based on international law. China has strictly fulfilled its international obligations and responsibilities, and has taken concrete actions to maintain the international arms control and nonproliferation system.

"We urge the US to reflect on their own behavior, refrain from smearing others and respond seriously to the international community's concerns about its commitment to following treaties," he said.