On 25 December a Moscow court sentenced Sergei Udaltsov, detained in prison since 4 December, to a further 10 days in prison for allegedly resisting police at a protest on 24 October. He had been due to be released on 25 December. 

On 13 December 2011, Amnesty International declared Sergei Udaltsov a prisoner of conscience who should not be detained at all. That day Amnesty Interational issued an Urgent Action calling for Sergei Udaltsov’s release. Amnesty International noted that Sergei Udaltsov had been in detention in Moscow since 4 December, “solely for attempting to lead peaceful protests against alleged election fraud." 

On 4 December, the day of elections to the State Duma, Sergei had been detained outside a Moscow metro station and sentenced to five days in prison for allegedly refusing to obey police orders. On 9 December, the day he was due to be released, police prevented him leaving hospital where he was at that time being held and, on 10 December, took him to a court where he was sentenced to a further 15 days in prison for allegedly having absconded after a previous arrest on 12 October.  

Sergei Udaltsov's health is poor since he has been on hunger strike and he was hospitalized during his detention.