According to Sage O'Donnell's mother, he was delighted with the kindness and hospitality of the Ukrainians.

The Australian Department of Foreign Affairs and Trade confirmed that an Australian was killed during the fighting in Ukraine.

According to his mother, Sage O'Donnell, from Victoria, died in action "defending the freedom of the Ukrainian people."

"Sage passionately upheld his values and served here in his own country and most recently in Ukraine. 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," she said.

Recall that Australia provides military assistance to Ukraine.