Has either the US or the EU ever promised not to retaliate against their enemy states or something? Actually, has any nation or national organization in the world ever promised that? You know, not to engage in war or any retaliation for anything? Just be arbitrarily 'fair'? You're creating standards that simply never existed. When war is on the table, all bets are off, it has always been that way.
Once you do what Russia did, no one should be required to honor anything with you. Countries are bound by laws, especially when you talk about Western countries, but there's always ways to get around to do what's needed if it's important enough - such as in military conflicts. If anything, the legal frameworks that tie their hands often prevented them from going even further, which would've been far better.
It also comes off incredibly disingenuous how lightly you're treating Russia here. You're pretending as if they just had an oopsie, a momentary lapse of judgement, a minor accidental misstep, and the heartless hypocrite West unfairly punished them for it by arbitrarily declaring them 'evil'. Like anyone else is scared because they might just stumble and that'll cause them to get on the West's bad side.
Unless you can think of other countries that are itching to start the new bloodiest, most cruel invasion of a sovereign nation on EU's doorstep, no one's situation mirrors Russia's. If they wanted the EU to sit idle, perhaps they shouldn't have invaded.
