She said in a statement that the family is “devastated” by the news.
“Sage was much loved by his friends and family. Sage’s humour, kind heart, values and laughter will be dearly missed. We are devastated by our recent loss of Sage,” she said.
”Sage passionately upheld his values and served here in his own country and most recently in Ukraine.
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“Sage chose to take action based on his empathy for the Ukrainian people, and the injustice that is taking place. He fell in love with Ukraine and its culture, and was humbled by the kindness and hospitality within his new community.”
The mother said Sage “chose to live his life true to his beliefs and cause”.
A DFAT spokesperson said they were “providing consular assistance to the family”.