"An operational test launch of an Air Force Global Strike Command unarmed Minuteman III intercontinental ballistic missile launched from Vandenberg Space Force Base Wednesday, Sept. 7, at 1:13 a.m. Pacific Daylight Time. The purpose of the ICBM test launch program is to validate and verify the safety, security, effectiveness, and readiness of the weapon system," the base said in a statement.
The US notified the Russian government in advance of the launch and transmitted pre-launch notification pursuant to the Hague Code of Conduct and pursuant to New START treaty obligations.