[runjake]

Edit: I've decided you should not do this -- there are way too many OPSEC concerns, but I'll leave my original comment, for posterity.

APRS[1] might fit the bill.

You could potentially acquire the hardware to do it and/or use a web interface/download a mobile app such as https://aprs.fi .

Using an Internet service like APRS, you could send location data (make sure you're practicing proper opsec) along with messaging, just pick an unused callsign (though you'll be violating EULAs).

Radio-wise I see a few nodes up in various areas of Ukraine, but none in Kyiv at the moment.

As long as they could periodically get signal. They could send short coded status updates (eg. 7 == good, 11 == send help, 8 == send supplies).

You technically need a ham license to operate the radio equipment.

1. https://en.wikipedia.org/wiki/Automatic_Packet_Reporting_Sys...

[leastonce]

Aprs messages sent to SMSGTE can be routed as SMS messages …