I was raised in the JWs and I have a natural disdain for war. Unfortunately, there are times when war is inevitable. Here you have a foreign country invading yours, bombing your whole world, willing to kill your family, friends and neighbors and you're supposed to be pacifist about it? That doesn't make sense to me.
If I lived in Ukraine, I doubt that I'd be able to just walk away. Let's face it. There are just and unjust wars. In the end, I believe you can exercise your freedom of conscience. But to blindly be pacifist no matter the circumstances? Unless you're an actual priest, its not a sustainable position for normal citizens to take. Unfortunately, in wars like this, not taking a stand is in fact taking a position for the enemy.