Tbh, liberal Russia would be much more dangerous for Europe, if we look at Dutch Republic or USA. At least, if we talk about 18-th-19th century vigorous liberalism and not about its modern anemic shadow.
That's again just your opinion about liberalism.
The institutional strengths of it are what is keeping us both free and safe, relatively, in Europe at this point. It's what is holding up, still, against Trump in the US too.
Same is not the case with Russia, which is a sham-version of it at best (institutions are in place, they just don't do the job, having been co-opted and repurposed).
The Ukranian case is one of shooting for that kind of development, against which Russia has gone to open war even.
The Ukranian case is interesting also because it highlights the original connection between nationalism and liberalism. In most of Europe that occurred so long ago now, people have forgotten that this was an original compact – the nations against imperialism. People find it troubling – since after WWII both the conservative and revolutionary fascist versions of nationalism were discredited, and everyone has forgotten the original Liberal phase of nationalism (so long ago).
And Russia has not gotten around to anything like it. (Russia needs to work through the back-log on the Soviet era too, and has not yet quite begun – and will not be able to under Putin either.) This is the bit where Russia is actually stuck in history, unable to move either forward or even backwards. Ukraine could be a forerunner, but clearly the current Russian conception of Russia cannot accept that the solution would come from Ukraine, with Russia following its lead. So Russia is stuck.
That these institutional arrangements have enemies and are being attacked – by the likes of Orban's Hungary, Putin's Russia, CCP China, Trumpism in the US – only says they matter like all hell.