Iran has threatened to block a proposed transport corridor in the Caucasus region, unveiled under a peace plan brokered by U.S. President Donald Trump. The corridor would connect Azerbaijan to its exclave of Nakhchivan through southern Armenia, offering strategic access to Turkey and facilitating energy exports. While Iran's top adviser warned of military readiness to prevent geopolitical changes, analysts suggest Tehran lacks the means to stop the project. The peace plan, hailed as a paradigm shift, faces a key obstacle: Armenia must amend its constitution to remove territorial claims over Nagorno-Karabakh. Armenian Prime Minister Nikol Pashinyan has called for a referendum on the change, but no date has been set. Russia, not included in the summit, urged regional solutions and cautioned against Western intervention, while Turkey welcomed the accord. Despite optimism, questions remain over security, customs arrangements, and Armenia's reciprocal access, leaving the corridor's future uncertain.