US warned Russia and also posted an embassy warning on March 7 to all US citizens to avoid large crowds. Putins response?
Russian President Vladimir Putin rejected US Embassy alert on an imminent attack
On Tuesday at a meeting with senior Federal Security Service officers, Putin hit out at "frankly, provocative statements" by Western officials earlier this month warning of a possible imminent terrorist attack in the city.
"All this resembles outright blackmail and the intention to intimidate and destabilize our society," the president told Russia's main internal security service, known as the FSB.
https://timesofindia.indiatimes.com/world/rest-of-world/russian-president-vladimir-putin-rejected-us-embassy-alert-on-an-imminent-attack/articleshow/108740433.cms