MOSCOW, July 21 (RIA Novosti) - A new Russian reconnaissance helicopter, Ka-31, has been presented to foreign delegations at the Farnborough 2004 international air show, reports Rosoboronexport, Russia's main arms exporter. Presenting the helicopter at Farnborough, Russian officials pointed out that many nations nowadays feel an acute need for lightweight reconnaissance aircraft, ones that could provide their armed forces with timely and accurate intelligence while also exercising control of sea, land, and aerial borders. And using large reconnaissance planes for these purposes may be too costly. According to its designers, the Ka-31 helicopter can be employed in both military and...