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A post on Ask Lemmygrad by user Cyber Ghost titled "What are the reasons why Russia attacked Ukraine?"
Below is the comment by user @cfgaussian reading: "The Nazi Kiev regime attacked the ethnically Russian Donbass for eight years intending to commit genocide in their quest for an ethnically pure Ukraine and Russia finally came to their aid after it became clear that the Minsk agreements were never going to be honored. Also, NATO was turning Ukraine into a hyper militarized threat to the integrity and security of Russia itself. Refusal of the US and Europe to negotiate on a new inclusive security framework, refusal to stop NATO expansion eastward, and the relentless and violent anti-Russian psychosis that has gripped Ukraine since the Maiden coup that triggered a civil war in a country in which half or more of the population are essentially Russian became intolerable."
User Summertime Soviet has replied to the comment saying "It's a shame we can't pin comments on posts, because this one would get a pin from me.
so instead, have this Farmer_Heck seal of approval"
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Don't think it was the reason there, since France and the UK declared war on Germany after they invaded Poland, so they didn't need a reason. However the Nazis used this line of argument against pretty much every neighbouring country. Especially with Poland which had a huge German population on the territory annexed after the first world war, and against Czechoslovakia it was indeed the cited casus belli.