No, they chose to fight for their soverengty and freedom as most countries would who were invaded if they had the capability. I think you will find that most ethnic Ukrainians actually don't like Russia and that is why they left when the USSR broke up, so neighbourly brothers is a ridiculous description.
they chose to fight for freedom by selling their sovereignty to the west? and they don't have the capability to defend them self so they got the west to help, when you look at the sanctions and the financial restrictions placed on Russia by the west, you will think that this is our war, the west is so invested in this war that if Ukraine don't win this, the shame and stigma will linger for a very long time.
not most, some Ukrainians don't like Russia, that's perfectly fine. because they don't like Russia, don't mean we should go and arm them to go get the Russians, in fact this is what we do very well, we always try to arm a faction to fight against countries we don't like, it almost happened to the Iranian Kurds, Trump tried to get the Kurds to fight Iran with him but the Kurds were smart, they dodged it clean.. Ukraine kind of stupid