Soviet wide-body aircraft, and it remains the world's largest turboprop-powered aircraft. Antonov designed and presented a nuclear-powered version of the An-22. It was never flight tested. In 1966, after the major expansion in the Sviatoshyn neighbourhood of the city, the company was renamed to another disguise name: "Kyiv Mechanical Plant". Two independent aircraft production and repair facilities, under engineering-supervision of the Antonov Bureau, also appeared in Kyiv during this period. Prominence and Antonov's retirement In the 1970s and early 1980s, the company established itself as the Soviet Union's main designer of military transport aircraft with dozens of new modifications in development and production. After Oleg Antonov's death in 1984, the company was officially renamed as the Research and Design Bureau named after O.K. Antonov () while continuing the use of "Kyiv Mechanical Plant" alias for some purposes. Late Soviet-era: superlarge projects and first commercialisation In the late 1980s, the Antonov Bureau achieved global prominence after the introduction of its extra large aeroplanes. The An-124 "Ruslan" (1982) became the Soviet Union's mass-produced strategic airlifter under the leadership of Chief Designer Viktor Tolmachev. The Bureau enlarged the "Ruslan" design even more for the Soviet spaceplane programme logistics, creating the An-225 "Mriya" in 1985. "Mriya" was the world's largest and heaviest aeroplane. The end of the Cold War and perestroika allowed the Antonov company's first step to commercialisation and foreign expansion. In 1989, the Antonov Airlines subsidiary was created for its own aircraft maintenance and cargo projects. Independent Ukraine Antonov Design Bureau remained a state-owned company after Ukraine achieved its independence in 1991 and is since regarded as a strategic national asset. Expansion to free market Since independence, Antonov has certified and marketed both Soviet-era and newly developed models for sale in new markets outside of the former soviet-sphere of influence. New models introduced to serial production and delivered to customers include the Antonov An-140, Antonov An-148 and Antonov An-158 regional airliners. Among several modernisation projects, Antonov received orders for upgrading "hundreds" of its legendary An-2 utility planes still in operation in Azerbaijan, Cuba and Russia to the An-2-100 upgrade version. In 2014, following the annexation of the Crimea by Russia, Ukraine cancelled contracts with Russia, leading to a significant income reduction in Ukraine's defense and aviation industries. However Ukraine has been slowly recovering the deficit from breaking ties with Russia by entering new markets such as the Persian Gulf region and expanding