According to Reuters, Austin said US-supplied NASAMS air defense systems in Ukraine had intercepted every Russian missile, suggesting 100% success.

U.S. Defense Secretary Lloyd Austin, speaking at the start of a routine virtual meeting of dozens of defense ministers about Russia’s invasion of Ukraine, said that the United States and Poland would work together to gather more information about the explosion, but he did not assign blame.

On the other hand, NATO officials said an errant Ukrainian air defense missile likely caused an explosion in Poland on Tuesday.

The National Advanced Surface-to-Air Missile System (NASAMS) is a ground-based air defense system. The system is designed to protect an area from all types of aerial threats, including aircraft, cruise missiles, and unmanned aerial vehicles.