There was literally not a civil war in Ukraine. There was an insurgency led by Russian militias, resulting in an attempted coup by Pavel Gubarev, who tried to claim the position of governor in Donetsk.
These militias were proxies of the Russian Armed Forces. They were not Ukrainians rising up against Zelensky and demanding independence from the rest of Ukraine.
Over time, they admitted that they had been trained in Russia, that they were armed and supplied by Russia, and that they had thousands of Russian citizens in their ranks. Later, it also emerged that they were commanded by Russian Army officers.
Earlier this year, Putin finally conceded that many of these so-called 'separatists' were actually Russian combat veterans.
(Thanks for that helpful Wikipedia article, which contains all of this information).
And yet you blame the wrong side for that invasion. All of the blame lies with Russia. All of it. NATO is blameless. Ukraine is blameless. Even the US—for once in her vile, blood soaked history—is blameless.