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In page Kharkiv KhAI-1:

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The Soviet Air Force soon expressed interest in the design as an alternative to the Polikarpov R-Z then replacing the Polikarpov R-5 in the reconnaissance-bomber role. A single prototype was built of a KhAI-1VV (for Военный Вариант - Voennii Variant - "Military Variant"), armed with a rear-mounted machine gun, and bombs carried in internal racks. While performance was impressive, the bomb-release mechanism proved troublesome, and as development dragged on, the Air Force gradually lost interest.