俄罗斯喊话美国，美国喊话中国，中国回应：表示遗憾

Core Points - The expiration of the New START treaty marks the first time in over half a century that there are no treaties limiting the nuclear arsenals of the world's two largest nuclear powers, the US and Russia, raising concerns about a new arms race and nuclear proliferation [1][6] - The UN Secretary-General has stated that the risk of nuclear weapon use is at its highest level in decades, highlighting the urgency of the situation [1] Group 1: Nuclear Arsenal Overview - By 2025, Russia is projected to have 4,309 nuclear warheads, while the US will have 3,700, with approximately 1,770 of the US warheads deployed and 1,930 in reserve [1] - The US is undergoing a comprehensive modernization of its nuclear triad, including the replacement of the Minuteman III ICBM with the Sentinel ICBM, the replacement of Ohio-class submarines with Columbia-class submarines, and the procurement of the B-21 long-range bomber [2][4] Group 2: Treaty Implications - The New START treaty, which was signed in 2010 and extended in 2021, limited the number of deployed strategic nuclear warheads to 1,550 and established verification mechanisms, which are now no longer in effect [5][6] - With the treaty's expiration, both the US and Russia may increase their nuclear arsenals beyond 6,000 warheads in the next decade, as the constraints have been lifted [6] Group 3: Global Nuclear Dynamics - The absence of a nuclear arms control agreement may lead to an imbalance in global nuclear capabilities, prompting other nuclear-armed states to enhance their arsenals [9][10] - The potential for a nuclear arms race could escalate the quality and quantity of nuclear weapons, with implications for deployment in new domains such as space [10] Group 4: Future Negotiations - There is a call for a new nuclear arms control agreement that includes not only warhead numbers but also new delivery systems such as hypersonic missiles and nuclear-powered torpedoes [11] - The US has suggested that China should join nuclear disarmament talks, although China has expressed reluctance to participate, citing its nuclear capabilities as significantly lower than those of the US and Russia [13][14]