Trader consensus on Polymarket reflects an 89.1% implied probability for no US ally acquiring nuclear weapons before 2027, driven by the absence of any official announcements or verifiable programs among key candidates like Japan, South Korea, Poland, or Australia. These nations remain bound by Non-Proliferation Treaty commitments and rely on US extended nuclear deterrence through alliances such as NATO and bilateral pacts, creating high political and diplomatic barriers to proliferation. Recent developments, including China's April warnings about Japan's latent capabilities amid regional tensions and South Korea's January focus on nuclear-powered submarines rather than weapons, have not shifted official postures. No major catalysts in the past 30 days—such as legislative votes, executive actions, or diplomatic breaks—have emerged to alter this status quo, with technical timelines for breakout capacity exceeding the horizon despite occasional public polls showing support in Seoul and Tokyo. Late-breaking escalations, like intensified North Korean tests or alliance fractures, could theoretically move odds.