As of 1 September 2023, submitting a residence permit application in Russia is possible only in Moscow; see the press release by the Ministry for Foreign Affairs

On 29 August 2023, the Ministry for Foreign Affairs of Finland published a press release announcing that customers in Russia must handle all residence permit matters in Moscow as of 1 September 2023.

Finland’s Consulate General in St Petersburg will be closed as of 1 October 2023. If you live in Russia and apply for a residence permit to Finland, you will need to handle your application with Finland’s Embassy in Moscow.

See the press release published by the Ministry for Foreign Affairs of Finland: Changes to consular and entry services in Russia as of 1 September (um.fi)