Thanks to Котаро Кацура who posted this video on his channel and who offered this introduction:
When cleaning out the ruins of the Donetsk airport NAF troops saved 16
UAF soldiers who were buried under the rubble, initially there were
about 30 of them there, but only 16 survived while rests died waiting
for help promised by their command that never came. Each of them had
been given a solar-powered player with baptist preaching.