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I don't understand what "2.5 times less" is supposed to mean. I know what "2.5 times more" means or even what "2.5 times as much" is (both would be 2.5 x whatever) , but less? If one has something that is 2.5 times less than an amount, it would be a negative value that is 1.5 times the amount. Does this mean that the purchase arrangement for buyers of the Russian craft would have the buyer receive both one stealth fighter and at the same time be paid 1.5 times the cost of the US aircraft. Somehow I find that hard to believe, but that's exactly what the phrase "2.5 times less" implies.