An Australian man, Trevor Kjeldal, has died in Ukraine, according to the Department of Foreign Affairs and Trade (DFAT).
The ABC understands the man had been fighting in Ukraine when he was killed.
A DFAT spokesman said officials were "providing consular assistance" to the man's family.
"We extend our deepest condolences to the family and ask that their privacy be respected during this difficult time," the spokesperson said.
"We are unable to provide further comment."
His family confirmed his death in a statement.
"Trevor is a very valued and loved member of our family," said a family spokesperson.
"The depth of our grief at his loss is unfathomable."
"We would like to thank DFAT for their continued assistance in bringing it home to us."
Speaking at a news conference on Queensland's Sunshine Coast, Prime Minister Anthony Albanese described the man's death as "tragic news".
"My condolences to this man's family and friends," he said.
"I remind people that DFAT's advice is for people not to travel to Ukraine. This is a dangerous place.
"My heart goes out to the family and friends of the men involved."
The federal government's travel advice for Ukraine remains "don't travel".
DFAT's ability to provide consular assistance to those traveling there was severely limited due to the Russian invasion. This article was written by EDUKASI CAMPUS.