On 16 March 2022, the U.S. Embassy in Moscow issued a Demonstration Alert, which reads in part as follows: “According to media sources, mass anti-war demonstrations will continue particularly on weekends in several cities throughout Russia, specifically at central squares in Moscow and St. Petersburg. Thousands of people have been detained in previous anti-war protests across Russia in recent weeks. Russian authorities prohibit such demonstrations; there are reports of widespread arrests of demonstrators. U.S. citizens are reminded that even non-participating bystanders can draw scrutiny from security forces and have been detained. Given the substantial police presence and mass arrests, U.S. citizens should avoid demonstrations and any demonstration-related activities.”
The full text of the alert is available here.