[1]https://www.theverge.com/2022/3/15/22979381/phone-relay-capture-russia-milita
ry-unencrypted-communications-ukraine

   "In the latest communications setback to hit the Russian military, the
   Security Service of Ukraine (abbreviated as SBU) claims to have
   captured a hacker who was helping to provide communications services
   for Russian troops inside Ukrainian territory, [2]VICE reports.

   "The SBU shared details in a [3]tweet and Telegram message posted at
   around 10AM local time (4AM ET), including pictures alleged to show the
   hacker and their communications system, though the reports have not
   been independently confirmed.

   "According to the SBU’s Telegram post, the hacker was helping to route
   calls from within Russia to the mobile phones of Russian troops in
   Ukraine, and also sending text messages to Ukrainian security officers
   and civil servants proposing they surrender.

References

   1. https://www.theverge.com/2022/3/15/22979381/phone-relay-capture-russia-military-unencrypted-communications-ukraine
   2. https://www.vice.com/en/article/v7djda/ukraine-arrests-hacker-routing-calls-for-russian-troops
   3. https://twitter.com/ServiceSsu/status/1503642820527239169