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.

Australia's Prime Minister Anthony Albanese responded on Wednesday to the alleged death of Oscar Jenkins, a Melbourne man captured while fighting for Ukraine, swearing to take 'the strongest action

The Russians may have killed Australian citizen Oscar Jenkins, who fought for Ukraine. Australia promises to "take the strongest action possible" if this information is confirmed, Reuters reports, citing Australian Prime Minister Anthony Albanese.

Soldiers who served alongside Oscar Jenkins in the Ukrainian armed forces say they are convinced their Australian comrade was killed by Russia's military shortly after being captured last year.

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

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.

Australia has summoned Russia’s ambassador to the country over reports that a Melbourne man was killed after being captured while fighting for Ukraine. Anthony Albanese said on Wednesday that his government was “gravely concerned” about Oscar Jenkins,

Australian broadcaster ABC and CNN’s affiliate Seven News cited Ukrainian sources suggesting that the 32-year-old soldier might have been killed. Speaking at a press conference on Jan. 15, Albanese said his government is “urgently seeking clarification” about the situation,