1. Russia has one of the largest Muslim populations in Europe, and it's estimated that by the mid-2030s Muslims will constitute 30% of Russia's population (https://www.rbth.com/lifestyle/330358-islam-russia-russian-muslims; some sources claim that the the percentages of adherents to Islam in Russia might already be around this figure).Obviously the bolshewiks learn from their mistakes
They crushed every form of Russian culture/religion/history in the 10s, 20s and 30s. Yet 100 years later the Russian people are thriving as if that era has never even existed
However if you replace a people as a whole instead of just trying to remould their identity, culture, history and so forth they'll never be able to bounce back
It's a genocide in slow motion
2. Russia tried to join the Organisation of Islamic Cooperation as a full member in 2005, though it was instead given observer status. It has generally very close relations with the Islamic world.
3. Russia is an amazingly diverse country, both ethnically and religiously. It also contains Europe's only Buddhist-majority republic, Kalmykia: