Western intelligence agencies observed unusual activity by Iran’s Islamic Revolutionary Guard Corps Aerospace Force over the past hour ending at 2:16 AM UTC on December 21, 2025, involving coordinated movements of drone, ballistic missile, and air-defense units, along with abnormal command-and-control signals, deployments, and logistical movements, prompting heightened monitoring, sources familiar with the assessments told Iran International, as reported by @sentdefender on X. The activity was described as coordinated across multiple IRGC Aerospace Force units, according to the sources cited by Iran International in the post at https://x.com/sentdefender/status/2002554069769158869 during the reporting window from 12:46:55 AM to 2:16:28 AM UTC. This development follows earlier reports of Iran accelerating half-finished bunker construction and intensifying ballistic missile experiments, as noted by Israeli analyst Jason Brodsky on X in the prior two-hour period ending at 12:16 AM UTC, amid discussions between Israeli Prime Minister Benjamin Netanyahu and U.S. President Donald Trump on thresholds for action against Iran’s missile program.