Some resources for following military activities in Ukraine ...

I understand 8131 kHz is a Russian Air Force coordination channel. It is possible it could be picked up here in California but you can also hear it streaming online from SDR receivers in the region when there is activity: 

R2AJI WebSDR: 

Livestream of military flight tracking and SDR audio:

https://www.youtube.com/watch?v=gEunIYVisyY

Live cameras with audio from Ukraine:

https://www.youtube.com/watch?v=iZebYm-nenY