Nuclear-armed nations should reduce, not modernize, their nuclear arsenals despite growing geopolitical tensions.

This was a closely contested debate in which both sides demonstrated substantive knowledge of nuclear strategy, arms control history, and contemporary geopolitics. However, neither side achieved a decisive advantage, largely because both fell into similar rhetorical patterns: selectively citing evidence, making sweeping empirical claims without sufficient sourcing rigor, and occasionally mischaracterizing the opponent's position.

Pro opened strongly by framing the debate around opportunity costs, existential risk, and the action-reaction dynamics of arms races. Their most effective move was consistently pressing the point that deterrence theory's unfalsifiability makes it a poor foundation for trillion-dollar policy commitments. The argument that 1,550 warheads under New START already provides overwhelming deterrent capability was a powerful anchor throughout. However, Pro's performance weakened in later rounds through overreach—claiming the evidence was "unequivocal" when it clearly was not, and struggling to adequately address the multipolar challenge (China's buildup, Russia's treaty violations) that Con repeatedly raised. Pro also had a tendency to assert that Con's own sources undermined Con's position without always demonstrating this convincingly.

Con built a disciplined case around the current threat environment, emphasizing that adversary modernization programs are proceeding regardless of Western restraint. Their strongest contribution was the multipolar framing—arguing that bilateral reduction frameworks are inadequate when China is rapidly expanding its arsenal. Con also effectively highlighted the comparative cost argument (4% of defense spending). However, Con suffered from an over-reliance on deterrence theory as self-evidently correct, struggled to explain why modernization wouldn't trigger the very arms race dynamics Pro described, and occasionally engaged in circular reasoning (deterrence works because we haven't had nuclear war; we haven't had nuclear war because deterrence works).

The turning point came in Rounds 3-4, where Con gained a slight edge by more effectively engaging with Pro's specific arguments while Pro became somewhat repetitive. Con's closing was marginally more structured and forward-looking, though both closings were formulaic.