Iran Declares Any US 'Massive Assault' Will Be 'Resolutely Thwarted' — IRGC on Full Combat Alert; Day 81

Iran's official response on May 19, 2026 (Day 81) to Trump's threat of a 'full, large scale assault' was a direct counter-declaration: any US 'threat of massive assault at any moment' would be 'resolutely thwarted,' according to Iranian official statements reported by Al Jazeera's live blog. The statement represents Iran's standard deterrence posture — maintaining the public threat of devastating retaliation while back-channel diplomacy proceeds. The IRGC remains on what it declared as 'full combat readiness' in anticipation of any resumed US military operations, a state of elevated alert that has been maintained continuously since the ceasefire began April 8. Iran's declaration on Day 81 is notable for its directness: rather than using diplomatic language in response to the most concrete US strike threat since May 5, Tehran issued an immediate military counter-signal. This dual-track behavior — diplomatic flexibility (Iran's May 18 revised peace offer) combined with military readiness declarations — mirrors Iran's posture throughout the conflict. The IRGC's readiness messaging is supported by ongoing proxy activity: Iran-linked groups launched three drones intercepted by Saudi Arabia from Iraqi airspace on May 17–18 (Days 79–80), demonstrating that proxy capacity remains active even during the ceasefire. Iran's military posture on Day 81 is constrained by the practical reality of 80 days of US-Israeli strikes having destroyed significant portions of its integrated air defense, air force, and ballistic missile stockpiles — but Iran retains substantial retaliatory capacity via proxies, maritime operations, and remaining missile reserves.