The Armenian Defense Ministry bought special protecting covers for tanks from a Russian research institute. Each of them costs $2.675. They were presented at the Russian national exhibition that has been held in Armenia on December 2-5. According to the institute spokesperson, "Armenia is the only country in South Caucasus that bought such products." "The cover is capable to reflect radio-waves, so it makes the object (tank) invisible. Thus, it makes impossible for the enemy's sensors to detect its whereabouts until they come close directly to the object," informed the source declining to name the exact sum of the deal. According to the source, "American military institutions are also interested in the Russian know-how, but considering the national interests, the Russian party refused to accept an offer from the overseas customers," reported IA Regnum.