Do some research on who fired the first shots.
You might need some “research”, too. Putin said it was “farmers and miners” fighting against Ukrainian “nazis” and then later handed out medals to Russians from Moscow and regular army Russian soldiers. Something doesn’t add up there.
If the cause was just the lies from Putinist Russia would never have been necessary. Russia stole Crimea and murdered thousands of civilians including nearly a hundred children on that airplane. None of that was necessary. They chose to do that and own it all. Period.