China could have build a 10 ton attack helicopter like the Apachè or a 10 ton transport helicopter like the Black Hawk had China just imported the Klimov TV3 117 series turboshaft engines from the Ukraine. Russia imports them for the Mi-28 Havoc and other types of helicopters. Ukraine being a much more reliable defence partner than Russia would have been more than happy to sell. And China could have struck a deal with the Ukraine for 100% tech transfer on these engines. Like the J-10 that uses a Russian engine or the Type 99 tanks that uses a German designed engine or the Type 052C and the type 054A that uses engines from France, Germany and the Ukraïne. But i suppose that China thinks that helicopters aren't that important strategically and there for less urgent compared to fighter jets, destroyers, frigates and tanks that they can wait untill the domestic industry can come up with a indigenous design.