US allies face substantial technical, legal, and diplomatic barriers to acquiring nuclear weapons on this compressed timeline, including NPT commitments, IAEA safeguards, and the absence of declared programs or production infrastructure among non-nuclear partners. Recent statements from Japan and South Korea have explicitly reaffirmed non-nuclear policies while emphasizing reliance on US extended deterrence and trilateral coordination. NATO members continue to integrate US nuclear assets through existing sharing arrangements rather than pursuing independent capabilities. No official announcements, legislative actions, or verified advances in fissile material production have emerged in the past year that would indicate a shift toward acquisition by any ally before 2027. Trader consensus at 92.7% on "No" reflects these structural constraints and the limited window for meaningful progress. Late developments such as a sudden policy reversal or external security shock could theoretically alter trajectories, though none appear imminent.