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- Russia's invasion of Ukraine was an "intelligence fiasco," an intelligence expert wrote in The Times.
- Calder Walton is a scholar at Harvard University's Kennedy School of Government.
- He said that Russia's FSB had failed to adequately prepare for the invasion of Ukraine.
Russian President Vladimir Putin's invasion of Ukraine was his "greatest intelligence fiasco," an intelligence expert has claimed.
Writing in The Sunday Times, Calder Walton, a scholar at Harvard University's Kennedy School of Government and author of "Spies: The Epic Intelligence War Between East and West," said that Russia's FSB intelligence agency had failed to prepare for the country's invasion of Ukraine.