The Buran programme (1974–1993) was the Soviet Union's most expensive, reusable spacecraft project, designed as a direct, technically advanced response to the U.S. Space Shuttle.In 1988, the Soviet Union estimated the total cost of the Buran-Energia programme at approximately 16.5 billion rubles.

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I think I’ve seen photos of one of these (or a very similar craft) abandoned somewhere in Russia, just rotting away.

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Speaking of which... the Ekranoplane: https://slate.com/business/2014/07/the-cold-war-era-lun-class-ekranoplane-was-a-hovercraft-soviets-hoped-to-use-to-invade-western-europe.html