The US-Iran ceasefire will break by April 22, 2026, with either US or Iranian forces conducting offensive strikes at brigade scale or above against each other's assets or proxies, OR sub-threshold proxy incidents will trigger principal-level escalation between US and Iran.

The original prediction claims 68% confidence that a ceasefire holds through April 22 — only 14 days away. While the short timeframe does reduce opportunity for major escalation, it does NOT eliminate it. The core vulnerability is structural: US-Iran ceasefires depend on proxy actors honoring agreements they did not negotiate. Houthis, Iraqi militias, and other proxy forces operate with autonomy and hardliner incentives to spoil ceasefires. A single brigade-scale incident (coordinated Houthi attack on US facility, US response against Iranian assets, Iranian militia strike on US base) would breach the claim. Sub-threshold incidents are virtually guaranteed to occur within 14 days given ongoing proxy violence; the question is whether these trigger principal-level escalation. Historical precedent (2019-2020 cycle, April 2024 missile exchanges) shows that sub-threshold incidents routinely cross the escalation threshold through miscalculation, domestic pressure, and command-level retaliation. The 68% confidence in the original reflects only modest conviction — this is not a high-confidence claim. The negation recognizes that ceasefires in this region are inherently fragile, proxy violence remains endemic, and the 14-day window is sufficient for at least one incident to cross the brigade-scale threshold or trigger principal-level escalation through miscalculation.