Ruben Tatevosovich Yesayan tested what Russian four-engined long-haul wide-body airliner designed by Ilyushin?
Ruben Yesayan:  Yesayan tested several aircraft, including Tupolev Tu-334, Tupolev Tu-154, Ilyushin Il-76MF, Ilyushin Il-96 and Ilyushin Il-114, and received the title of the Hero of the Russian Federation. Ilyushin Il-96: The Ilyushin Il-96 (Russian: Илью́шин Ил-96 ) is a Russian four-engined long-haul wide-body airliner designed by Ilyushin in the former Soviet Union and manufactured by the Voronezh Aircraft Production Association in Voronezh, Russia.
Ilyushin Il-96