Where was Union of Salvation filmed?

2019 film directed by Andrei Kravchuk

Union of Salvation (2019) was filmed in Moscow, Saint Petersburg, Nizhny Novgorod, Gatchina, Peter and Paul Fortress, Tsarskoye Selo and 6 more places, 12 places named in its Wikipedia article, in Russia. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.

See them on the map → Wikipedia Source data