It’s so easy to point a finger at someone like Russia and simply say well they started it, they are the aggressor, but it usually takes two to tango, and certainly this is the case here which is constantly being denied cause it’s so convenient, we didn’t provoke, we did NOTHING!
It only takes one to invade, that's like saying Iraq was responsible for US invading them.
And yes, Ukraine did nothing, Russia encouraged separatist movements and used it as a pretext and now they are attacking regions beyond those separatist regions. And this is not the first time for Putin, he wants to bring back the USSR which he said so himself and has tried it with other neighbors.