In January 2021, he was arrested for allegedly organising protests held in Gomel following the 2020 Belarusian presidential election; on 3 November 2021 he was sentenced to serve three years in a penal colony.

[1] Sudalenka worked for the natural gas infrastructure and transportation company Gazprom Transgaz Belarus until 2006, when his contract was not renewed after he publicly supported opposition presidential candidate Alyaksandr Milinkevich.

On 18 January 2021 Sudalenka, alongside Maryia Tarasenka and Tatsiana Lasitsa, were arrested from Viasna's Gomel branch for breaching article 342 of Belarus' criminal code, "organisation and preparation of actions that grossly violate public order"; their offices were also searched.

[6][3] Sudalenka and Lasitsa's trial started on 3 September 2021 in Tsentralny District Court in Gomel behind closed doors at the request of the judge, Sergei Solovki.

Evidence cited by the prosecution included a Facebook posts where Sudalenka donated firewood to a protester's family; him taking part in a seminar on digital security for human rights activists; urging people to gather near a jail where an activist was imprisoned; and assisting with the payment of fines and legal fees, as well as providing legal advice, to protesters.