I'm not a fan of military interventions made by US, but there is big difference between US and Russia. Russia is annexing conquered lands.
So, ultimately yes, two wrongs do not make a right, though I'm personally unconvinced that the Russians are wrong here, since Crimea has a history of being anti Ukraine and is only a part of it due to Nikita Krushchev giving it to his own SSR and the USSR breaking up inconveniently. But, there can be no doubt that we'd happily and blithely commit a third, future, wrong if it were in our interests to, and dress it up as the right thing to do, whatever international law says. Then, we'd expect Russia and everyone else to go along with it. Most people would consider a corrupt lawman far worse than a mere criminal committing the same act.
Well, few years before Kruschev, Crimea was ethnically cleansed. If it wouldn't be, then it wouldn't be now dominated by Russians. Also it wasn't always part of Russia, it was conquered by them.
Using this thinking, Poland have the right to invade Lviv, after all it was Polish until 1945 and still a lot of Poles live there. Germany have the right to invade western Poland. Lithuania can invade Belearus and oh boy, I don't even want to start talking about ex-Yugoslavian countries.
If we will start looking at historical borders in Europe then pretty much every country have right to invade his neighbors.
There are plenty of regions in Eastern European countries where Russians are majority. If you allowing Russia to conquer regions dominated by Russian ethnicity, then you pretty much opening them doors to invade any other Easter European country.