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.

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,

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