- Ukraine’s Acoustic Drone Detection Network Eyed By U.S. As Low-Cost Air Defense Option. Ukraine's network of nearly 10,000 acoustic sensors has been highly effective and the U.S. Army is interested in copying it. https://www.twz.com/air/ukraines-acoustic-drone-detection-network-eyed-by-u-s-as-low-cost-air-defense-option 59 comments worldnews