Moscow noted the transfer of 540 military contractors in June alone and says the mercenaries are tasked with protecting oil facilities and training militants loyal to the US.
Private military contractors offering armies for hire emerged as a powerful stakeholder in the business of war. Governments can outsource compartmentalised jobs to mercenaries or private security contractors, without much international oversight.
The global market for mercenaries and private military contractors is worth more than $100 billion, and the lines that differentiate the two are blurry.
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