MOSCOW (AFP) - Russia has signed a contract with the US Army to deliver 21 MI-17 helicopters to Afghanistan, new agencies quoted the defence ministry's arms oversight service as saying Friday. The contract includes new helicopters, along with "delivery of spare parts, on-ground service, and material-technical support," RIA Novosti quoted the Federal Service for Military-Technical Cooperation statement as saying. The contract was previously valued by the Russian media at $367.5m. The Russian helicopters will be sent to be used in Afghanistan's air force starting in October, RIA-Novosti reported.