American intelligence had been tracking the group closely and believed the threat credible. Within days, however, President Vladimir V. Putin was disparaging the warnings, calling them “outright blackmail” and attempts to “intimidate and destabilize our society.”

Three days after he spoke, gunmen stormed Crocus City Hall outside Moscow last Friday night and killed at least 143 people in the deadliest attack in Russia in nearly two decades. ISIS quickly claimed responsibility for the massacre with statements, a photo and a propaganda video.

. . .

Now, Mr. Putin and his lieutenants are pointing fingers at Ukraine, trying to deflect attention from a question that would be front and center in any nation with an independent media and open debate in its politics: How did Russia’s vast intelligence and law enforcement apparatus, despite significant warnings, fail to head off one of the biggest terrorist attacks in the country in Mr. Putin’s nearly quarter century in power?

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