The sign held by Marina Ovsyannikova says:
No war
Stop the War! Don’t believe the propaganda. They’re lying to you here.
Russians against the war
Marina Ovsyannikova has guts! . She can get 15 years in prison for what she did.
Update, March 16:
English translation of Marina Ovsyannikova's statement before her on-air protest and subsequent arrest https://twitter.com/expatua/status/1503477321642217483