Ukraine and another British man has been reported missing by the Foreign Office.The men are understood to have volunteered for Ukraine's military to fight against invading Russian soldiers.Whether the pair were involved in conflict has not been confirmed by The Foreign, Commonwealth and Development Office (FCDO) nor have their identities been shared.An FCDO spokesperson said: "We can confirm that a British national has been killed in Ukraine and are supporting their family."They added: "We are aware of a British national who is missing in Ukraine and are supporting their family. We are urgently seeking further information."Last week captured British soldier Aiden Aslin spoke to his mum over a Facebook messenger video call for the first time since Russian soldiers took him as a prisoner of war.