By the time of the collapse of the USSR the project was in full swing. Perestroika resulted in lower project costs. However, by December 1991, many structural elements had already been manufactured: the nickel alloy wing torque box, part of the fuselage, cryogenic fuel tanks, and composite fuel lines. For comparison, at the time the US X-30 project was stuck on an attempt to build a titanium alloy section of the fuselage. The Tu-2000 could have been completed by the year 2000, but circumstances had changed.