The growing role of mercenaries in the Ukraine conflict has shone a spotlight on the shadowy part freelance soldiers can play in modern warfare.
Australian security expert John Coyne told nine.com.au the term 'mercenary' encompasses a broad range of irregular military forces.
"Mercenaries have been around for centuries ... but today they are more than just a gun for hire," Dr Coyne, of the Australian Strategic Policy Institute, said.
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