How likely is a regime change in Russia?

Russian President Vladimir Putin is expected to face some serious challenges in 2021. The West has already started pressuring the Kremlin to release Alexey Navalny – the anti-corruption opposition figure who was arrested on January 17th upon his return from Germany, where he spent five months recovering from being poisoned by an alleged Russian nerve agent, Novichok. The West is aslso using the Navalny imprisonment to try -- once again -- to stop construction of the Nordstream II pipeline which is to carry Russian gas under the Baltic Sea to Germany. The US wants to limit European reliance on Russian gas and increase Europe's reliance on American gas.