Rights lawyers have said the singer is now caught up in jail “carousel”, a practice whereby prosecutors lob a string of minor charges against defendants to keep them in constant custody.
In the latest case, she was found guilty of organising the mass gathering of people and sentenced to another 13 days in prison, an AFP correspondent reported from the St Petersburg court.
Since Loginova’s arrest, a flurry of videos in support of her and her band Stoptime have flooded TikTok, while other young street performers have expressed solidarity with her in public, risking fines or jail sentences themselves.
The band’s guitarist, Alexander Orlov, was also jailed for another 13 days.
In court, he sat between his lawyer and a masked police officer.
Street singers in other Russian cities who performed in support of Loginova have also faced arrests.
A day earlier, independent media reported that a court in the city of Perm, more than 1500km east of Saint Petersburg, handed 20-year-old performer Yekaterina Romanova 15 days in jail.
Romanova, also known as Yekaterina Ostasheva, had performed in support of Loginova in Perm and had already been given seven days in jail this month.
Thousands have been detained since Russia banned criticism of the Army shortly after launching its full-scale military offensive on Ukraine in February 2022.
-Agence France-Presse