US allies face prohibitive technical, regulatory, and diplomatic barriers to acquiring nuclear weapons before 2027. Civilian nuclear cooperation agreements, including the 2026 US-Saudi pact allowing limited uranium enrichment, advance energy programs but explicitly exclude weapons pathways and require years for any potential breakout capability. South Korea and Japan continue reaffirming commitments to peninsula denuclearization and extended US deterrence amid North Korean advances, with no active indigenous weapons programs underway. Recent congressional reviews and intelligence assessments highlight proliferation risks from latency but note no decisions or infrastructure shifts enabling delivery by early 2027. Trader consensus at 94.8% for "No" reflects these structural constraints and absence of imminent catalysts.