没有规则的核赛场，美国疯狂扩核，俄罗斯亮出致命反制

Group 1 - The expiration of the New START treaty on February 5 marks a significant shift in global nuclear disarmament, moving from a phase of reduction to one of potential escalation [1][2] - The U.S. plans to increase its nuclear arsenal, with a projected budget increase from $756 billion to $946 billion over the next decade, representing a growth of over 25% [2] - The U.S. is also pursuing the "Iron Dome" initiative to develop an unconstrained missile defense system, which could provoke a new arms race as other nations enhance their nuclear capabilities in response [2][3] Group 2 - The New START treaty, originally signed in 2010, limited both the U.S. and Russia to 1,550 deployed nuclear warheads and 700 delivery vehicles, but relations have deteriorated significantly since the Ukraine conflict [3][4] - Russia has shifted its nuclear policy from a no-first-use stance to a more aggressive posture, developing new strategic weapons like the "Zircon" and "Poseidon" to counter NATO's conventional advantages [5][6] - The U.S. has not committed to a no-first-use policy, which raises the nuclear threshold and complicates the strategic landscape [4][5] Group 3 - The U.S. is seeking to involve China in nuclear negotiations, but China maintains its position of a defensive nuclear strategy and will not participate in arms races [7][8] - The introduction of new technologies and high-survivability weapons complicates future arms control negotiations, as the U.S. continues to increase its nuclear capabilities [7][8] - The current state of nuclear relations reflects a breakdown of strategic trust and frameworks, leading to a more dangerous global environment than during the Cold War [8]