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There are always questions after any attack as to why it was not stopped or detected. But the Moscow attack raises particularly difficult issues for Vladimir Putin at a time of international tension and mistrust. And much of that comes because of a warning from Washington.
The 7 March warning from the US to its own citizens was unusually specific. It talked of reports that "extremists" had "imminent plans to target large gatherings in Moscow" and specifically mentioned concerts. It advised Americans in the city to avoid large gatherings over the coming 48 hours.
The timing may not quite match, but other details do tally closely with events on 22 March. It seems clear Washington had some kind of intelligence and that it related to Islamic State (IS) - the group that has issued a statement saying it was behind the Moscow attack.
As well as the public warning to its own citizens, the US also said it had communicated with the Russian government directly.
"The US government also shared this information with Russian authorities in accordance with its long-standing 'duty to warn' policy," a US official said in a statement after the attack.
There are channels through which intelligence is shared between countries - even those that are not allies - especially when it relates to possible attacks on civilians.
But the problem is that Moscow dismissed the warnings.
Three days before the attack, Russian President Vladimir Putin addressed the board of Russia's Federal Security Service (FSB), whose job is to defend the country. The top priority, he told the assembled leaders of the security service, was to support what he called the special military operation - the official phrase for the full-scale invasion of Ukraine.
