# US-Iran military and diplomatic tensions > Live situation record from CLSTR: https://clstr.news/situations/us-iran-military-and-diplomatic-tensions > Updated: 2026-09-20T05:49:24.000Z. Sources: 4. Developments: 2. Military activity involving US B-1B Lancer bombers at RAF Fairford in the United Kingdom has increased amid escalating tensions between the United States and Iran. Initial reports noted a surge in bomber flights over Wiltshire and Gloucestershire, coinciding with US Central Command strikes against Iranian air defense systems, radar installations, and maritime assets. US officials characterized these strikes as a response to threats against American personnel and commercial shipping. As diplomatic tensions persist, a B-1B Lancer has since departed from RAF Fairford. While its specific mission remains unconfirmed, the movement occurs as Iran seeks renewed negotiations. Mohsen Rezaei, secretary of Iran’s Supreme National Security Council, indicated that Tehran has proposed conditions for talks via Qatar, including the end of hostilities, the release of frozen funds, and the termination of the US naval blockade. Despite these diplomatic efforts, Iran has expressed readiness for continued military confrontation. ## Timeline ### 2026-09-20: US B-1B bomber departs UK amid US-Iran diplomatic tensions A US B-1B bomber has departed RAF Fairford in the UK as Iran awaits a response from President Trump regarding conditions for renewed diplomatic negotiations via Qatar. 2 sources. https://clstr.news/cluster/us-b-1b-bomber-departs-uk-amid-us-iran-diplomatic-tensions ### 2026-09-02: US B-1B Lancer bomber activity increases near RAF Fairford Increased sightings of US B-1B Lancer bombers over Gloucestershire and Wiltshire follow intensified American military strikes against Iranian air defense and maritime assets. 2 sources. https://clstr.news/cluster/us-b-1b-lancer-bomber-activity-increases-near-raf-fairford --- Cite as: US-Iran military and diplomatic tensions. CLSTR, https://clstr.news/situations/us-iran-military-and-diplomatic-tensions