Like all Germans had to pay for Hitler's crimes, all Russians will have to pay for Putin's.
If you factor in legacy up to Rurik in 9th century, then Katyn would be quite far from the top of the list.
imagine iran using stuxnet on an american facility or even an israeli nuclear facility. that is what i am asking for "justification".
if you say usa wasnt justified in any of the wars, we are on the same side. great
> Iraq
Not justified. See e.g. https://www.nbcnews.com/id/wbna22794451
> Vietnam
The justification used was the Containment doctrine, meaning the containment of Communism. See https://en.wikipedia.org/wiki/Containment Basically, the US military feared the possibility that Communism would spread across the globe, which matched the rhetoric used by Communist politicians and writers, who promised a global workers' revolution. The US feared this outcome and sought to contain it via war. You can say they were unjustified or they were justified; that depends on your point of view about what constitutes a just war. https://en.wikipedia.org/wiki/Just_war_theory
> Afghanistan, Libya
I'm not familiar with the details of these conflicts so I won't try to address them.
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From a perspective of a neutral party, if you're trying to decide whether to side with the US or Russia, I would point you to the Democracy Index https://en.wikipedia.org/wiki/Democracy_Index , which is the closest thing to a consensus view of the moral rightness of countries. The USA is not at the top of the index by any means (heck, our neighbor Canada has us beat) but the USA scores far better than the other military superpowers (China and Russia).
From a standpoint of realpolitik https://en.wikipedia.org/wiki/Realpolitik , no country is purely good or evil but it's smart to side with the country that would result in a better long-term outcome for the world, hence why I refer you to the Democracy Index.