While North Korea sends hundreds of balloons, loaded with rubbish and manure, across the border, South Korea is setting up giant speakers to blare K-pop music for miles into the North. Sitrep assess the risk of a playground scrap going out of control, and explains why many heavily armed nations indulge in childish tactics when they don’t want an all-out fight. Ukraine has been trying out experimental AI drone technology on the battlefield to lock onto targets by identifying their voice, or avoid Russian jamming.  Olivia Savage from Janes tells us what she’s seen and heard. And former RAF Officer Mike Murtagh shares stories from his time spying on the Kremlin in the 1990s, including fake firefighters, honeytraps and a bear on the loose.