Ukraine doesn’t need to subdue Russia, just repel its soldiers. That can and has been done before. Chief Red Cloud did it to the US Cavalry in the black hills way back when. The Maccabees did it to the Greeks. The Irgun did it to the British. Gandhi did it to the British. The colonials did it to the British. When you’re British, everyone drives you from their land.
“... The Irgun did it to the British. Gandhi did it to the British. ....”
Worked here because the modern British don’t like to look bad!