Russia's federal and local government locked in dispute over which one of them should pay for repairs. Neither is willing to stump up the cash

In the meantime, Foster says, the structure is "neglected and dying" and without "faithful restoration" is doomed to fail. Several other leading European and US architects have backed Foster's letter, sent last month to the Moscow authorities. The art critic Andrew Graham-Dixon is another fan, and rode to the top in his recent BBC series on Russian art. Dixon-Smith hailed it as "one of the great monuments of the constructivist post-revolutionary period".

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Under the headline "corroded masterpiece", Russia's Izvestiya newspaper contrasted official Russian indifference to the building's fate with Foster's vigorous campaign.

"Only foreigners care about its destiny," the paper said.