K-Pop Jamming Compounds Russian HF Woes in Ukraine….

The Russian Army relies heavily on HF radio. Using transmissions of 3-30MHz, HF transmissions traverse BLoS ranges because they bounce off the ionosphere back to Earth, like a snooker ball bouncing off the table’s cushion. This phenomenon means HF transmissions can reach ranges of thousands of miles. Significant quantities of unencrypted HF military traffic has been observed on Russian Army HF networks since the invasion of Ukraine began on 24 February. The amateur ‘radio ham’ community has documented military HF traffic on HF frequencies of 4.2MHz and 7.8MHz.
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https://www.shephardmedia.com/news/landwarfareintl/k-pop-jamming-compounds-russian-hf-woes-in-ukraine/