The weapons shipment will be worth up to $400 million, and the U.S. has sent more than $43 billion to Ukraine since Russia launched its invasion.
The Pentagon is seeking to give Ukraine what it needs to defend against Russian drones targeting the embattled country's energy infrastructure.
The U.S. military in recent weeks took contracting actions favoring Lockheed Martin worth $179 million.
Officials tried to answer unresolved questions for lawmakers.
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