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In page Nagorno-Karabakh War:

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Further signs of Azerbaijan's desperation included the recruitment by Aliyev of 1,000–1,500 Afghan and Arab mujahadeen fighters from Afghanistan.[6][7] Although the Azerbaijani government denied this claim, correspondence and photographs captured by Armenian forces indicated otherwise.[8] A United States-based petroleum company, MEGA OIL, also hired several American military trainers as a prerequisite for Azerbaijan to grant it drilling rights at its oil fields.[9]