Listing some more from memory (yes, from memory), including subgroups or specific variations within already mentioned groups, for further public interest and awareness. Disclaimer that, of course, not everyone within a group has identical opinions, but information war, culturicide and linguicide have for centuries been parts of Russian Imperialist conquering strategy, so that's expected. Here it goes:
Believe Adyghe people (also known as Circassians) and their diverse tribes like Kabardians, Shapsugs, Ubykhs, etc, and their relatives Abkhazians; believe other people in the Caucasian mountains: Ingush people (close relatives of Chechens/Ichkerians), Ossetians/Alans (a renowned ancient valiant tribe, who influenced the culture of the people of Iberian peninsula, Gallia and Albion/Britain in the early Middle ages, including leaving the popular first name 'Alan' itself), Nogai people, Kalmyks, Tabasarans, Dargins, Laks, Tsez, and ~30 other ethnolonguistic groups in Dagestan and surrounding area;
Believe Jews of the Russian empire/Soviet union/Russian federation, Starovers (Old Believers), Rodnovers (native slavic paganism practitioners)
Believe Belarusians, Latgalians, Livonians (please support the resurrection of their language, last native speaker died in 2013), Votic people, Veps people, Ingrians/Izhorians (often used to denote somewhat separate groups), Karelians, Kildin Sámi, other Sámi people now that we are mentioning them, Erzya and Moksha people (erroneously clumped together into a homogenous group called Mordvins, used currently to erase the two groups' distinct cultural heritage, though they are still close relatives; Erzya have a special place in my heart. Mon vechkan Erzjan' mastor dy lomant'), Mari (formerly Cheremys) people, Komi Zyrians, Komi Permians, Komi Yaz'vins, Udmurts, Volga Germans, Chuvash people, Bashkirs, Crimean Tatars, Krymchaks, Mariupol Greeks, Turkmens, Uzbeks;
Crossing the Ural mountains into North Asia: believe Mansi, Khanty, Nenets, Enets, Nganasan, Selkup people, Ket people (the last remaining Yenisean language group speakers and rather close relatives of Na-Dene people of western North America), Dolgans (subgroup or cousins of Sakha people), Chulyms, Kyrgyz people (I recommend watching the Kyrgyz movie "Kurmanjan Datka", it's on youtube with subtitles, about the 19th century girl-grew-up-to-be-epic-queen to defend and unite the Kyrgyz people against the Russian imperial conquest), Buryats, Even people, Evenki people, Ulcha people, Negidal people, Nivkh people, other Amur river region natives, Sakhalin Ainu people, Koryaks, Chukchis, Alyutors, Aleut archipelago natives;
Believe diverse ethnic and linguistic groups of people that suffered in Syria: Assyrians, Kurds, some Yazidis (?), probably some Adyghe people who resettled in Syria since the forceful exodus in 1864 during the Circassian genocide, and others;
Believe people in countries with russian paramilitary presence or some kind of meddling: Central African Republic, Eritrea, Sudan and South Sudan, Mali, and more.
And now, more than ever, Ukrainians.
Victory, freedom, and life, or conquest, torment, and death.
May all sentient beings be free to live in peace and prosperity.