Danger of attack in Moscow: US embassy alerted – FSB probably thwarts IS terrorist attack in Russia. American citizens advised to “avoid large gatherings for the next 48 hours” The warning was later adopted by the British Embassy in Moscow.

It is unclear whether the Russian operation and the US embassy warning are related. The Russian presenter and well-known Kremlin propagandist Margarita Simonyan commented on the warning. She couldn't help but reproach herself. “Inexpensive 'partners'!” she wrote.