KYIV – Senior Ukrainian officials led 60 foreign diplomats on a tour of damaged government offices in the heart of Kyiv on Monday, a day after Russia’s largest aerial attack on Ukraine since its all-out invasion began more than three years ago.

Russia’s assault on Sunday involved more than 800 drones and decoys and occurred as months of U.S.-led peace efforts appear to be getting nowhere . Four people were killed as drones hit apartment buildings, and a plume of smoke rose from the capital’s main government building where top officials have their offices.

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It's believed to be the first time a Russian attack has struck the 10-story, Soviet-style building, which was built almost a century ago and has an imposing half-circle facade.

During the tour given to the di

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