What? Zelensky was blaming RUSSIA (not ISIS) for an attack — on its own people, even though ISIS claimed responsibility.
Where was Russian security after the US warning?
The U.S. passed a secret warning to Russia earlier this month of a plot to target large crowds in Moscow and even posted a warning to US citizens to avoid large crowds in Moscow.
Putin's response? He also spoke directly to what he said were "provocative statements" from the West about potential attacks within Russia. He said the warnings "resemble outright blackmail and the intention to intimidate and destabilise our society".
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.
https://www.bbc.com/news/world-europe-68646375