[7] In 2019, Demushkin was appointed interim head of the administration of the rural settlement Barvikhinskoye, Odintsovsky District, Moscow Oblast.

He also signed a Memorandum of Establishment with Yuri Belyaev (Freedom Party) and Stanislav Terekhov (Union of Officers).

[14] In July 2006, Demushkin was detained by law enforcement agencies in connection with his suspected involvement in an explosion near a mosque in Yakhroma.

The organization openly demanded the "cleansing" of the country from all "non-Russians", with the only exception being representatives of ethnic groups that did not have statehood.

[19] On March 12, 2011, he spoke at a rally in Moscow in defense of Colonel Kvachkov, who was accused of attempting to orchestrate a rebellion.

In July 2011, Demushkin, together with two associates (Alexander Belov and Vladimir Maksimov) went to Chechnya, after which he admired the state of affairs in the republic, which caused a mixed reaction among Russian nationalists.

In an interview with RIA Novy Region, Demushkin said that he did not exclude the possibility that the prosecution of Konstantinov could have been fabricated for political reasons.

Demushkin also added that prior to his arrest, law enforcement officers put pressure on Konstantinov in order to persuade him to cooperate.

On April 26, 2012, in an interview with RIA Novy Region, Demushkin expressed the opinion that a criminal case would be initiated against lawyer Dagir Khasavov [ru], who on the air with Ren-TV promised to flood Moscow with blood if Sharia courts were not created.

On August 14, 2012, Demushkin submitted documents to run for mayor of Kaliningrad, however, the Election Commission refused to register him.

[24][25] On August 22, 2012, he turned to the Patriarch of Moscow and All Rus' Kirill with a request to support the committee "For the Removal of Lenin."

Earlier, Demushkin turned to the Prosecutor General of the Russia Yury Chaika with a request to check whether the presence of Lenin's body on Red Square was legal.

In an interview with the Nevex TV news agency, he promised to completely change Russian television if he came to power, as it contributes to the moral degradation of young people.

According to the investigators, “the activities of the Slavic Union public association, despite being duly recognized as an extremist organization, have not actually been stopped.

[43][44] In March 2014, the world court of the Ostankino district of Moscow found Demushkin guilty of organizing an extremist community, referring to the Slavic Force movement, which he was the leader of.

Demushkin was sentenced to a fine of 200,000 rubles, but was released from punishment due to the expiration of the statute of limitations for the crime.

[49] In 2016, Demushkin was sentenced to two and a half years in prison for inciting hatred under Article 282 of the Criminal Code of Russia, an extremism statute.

[50] Demushkin spent eight months in the intensive monitoring sector, because in the materials from the investigator he was marked as prone to escape.

[54] On October 21, 2016, while applying for a permit for the Russian March, Demushkin was detained and placed on house arrest for engaging in extremism.

[59] On February 20, 2019, the Petushinsky District Court of the Vladimir Region ruled that Demushkin would receive an early release from Corrective Colony No.

[60] The basis for early release was the partial decriminalization of Part 1 of Article 282 of the Criminal Code of Russia, which concerned extremist activity.

[61] Soon after his release from prison, Demushkin was hired as a specialist in local governments in the rural settlement of Barvikhinsky [ru].

He was then appointed to the position of Chief Specialist of the Department for Organizational Work, Youth Affairs, Culture and Sports in Barvikhinsky.

In his new position, Demushkin checked the activities of the previous administration and fought against the unification of Barvikha with the Odintsovo District.