There is no double standard, because they are comparing different situations.
Take my country, Sweden. Russia is, apart from a short period if German belligerence, the only country to threaten Sweden fir the last 200-300 years. Russia, as such, is the "inheritance enemy" of the Swedes. The threat of Russia attacking, though politically ignored for the last 30 years, still has had a very big impact on our culture.
Then we have the large section of the populace that us Slavic- or Eastern-European-rooted, and thus carries their own historical baggage against Russia/USSR.
In addition to that history, it is the case that Russia has acted with increasing military hostility towards Sweden, with breaches of our airspace and similar often happening several times a year, as well as diplomatic threats being common -- the intimidation attempts that garnered international attention when Sweden and Finland tipped over to joining NATO earlier this year may have been newsworthy to the world, but for us it is just more of or the culmination of what we already get om a regular basis.
Then there's the socio-economic factor, where the people of Sweden are much more intertwined with Ukraine both by Ukrainians working here and Swedes working there, and this greater "everyday connection" results in greater emotional bonds.
So yeah, there's a whole slew of reasons for why Swedes would feel that "
Ukraine's sake is ours", to paraphrase an old relevant slogan, and you have to ignore all that history and currentory if you want to pretend the different reactions are just different standards for the same thing. It's a very flat view of the world to take.