Australia has vowed it will take the “strongest action possible” if Russia has harmed one of its nationals captured fighting for Ukraine, after reports emerged the prisoner of war may have been killed.

We have already summoned the Russian ambassador... We will wait for the facts to emerge. But if any harm has come to Oscar Jenkins, it is absolutely unacceptable, and the Australian government will take the most resolute measures,

Oscar Jenkins, an Australian teacher fighting for Ukraine, was reportedly captured and interrogated by Russian soldiers. His status and whereabouts are unknown.

Canberra is making "urgent inquiries" about the status of Australian citizen Oscar Jenkins, a volunteer soldier captured by Russia in Ukraine, after unconfirmed reports of his death, the 7News outlet wrote on Jan.

Australia said Wednesday that "all options are open" in its response to the reported killing of one of its citizens after his capture by Russian forces in Ukraine.

Australian Prime Minister Anthony Albanese promised the "strongest action possible" if reports of an Australian national being executed by Russian forces while fighting for Ukraine are verified, CNN reports.

Australia's Prime Minister Anthony Albanese has vowed to take decisive measures if harm has been inflicted on Oscar Jenkins, a Melbourne school teacher captured while fighting for Ukraine. Disturbing video footage from December shows Jenkins being interrogated by Russian forces.

Oscar Jenkins, a former school teacher from Melbourne, was seen being struck by a Russian interrogator in a video posted in December. View on euronews

Australia should downgrade diplomatic relations with Russia if the killing of prisoner of war Oscar Jenkins is verified, the nation's Ukrainian community says.