So what? That "one Ukraine" map is a snapshot in time. Those external national borders have been moved over and over in the past century. Crimea was part of Russia for 200+ years until Khrushchev literally gave it to Ukraine in 1954 as part of internal USSR politics. Crimea is less Ukrainian than Hawaii is American.
![](http://www.catholica.com.au/gc0/ak3/images/UkraineEthicMap_640x453.gif)
You would start WW3 over Russia reasserting control over Ukraine, with Putin undoing Khrushchev's unilateral "gift" in 1954?