Because their prosecution means going to war. I don't know about you but as someone living less than 30 minutes from Ukraine I don't want my country to go to war.

Si vis pacem, para bellum.

And what makes you think it won't, anyways?

Quoth Churchill: "An appeaser is one who feeds a crocodile-hoping it will eat him last."

The crocodile is still intent on eating you, even if you're nice to it. I really wish Europe would start understanding that.

If Ukraine falls, the war is coming whether we like it or not.