One point for consideration is logistics. The force has to get to its destination. To directly attack most of Europe, that would mean crossing the Mediterranean if you want to attack Europe directly. A crossing through Istambul or Gibraltar would be killed before it was given a chance to happen. Since Europe has an overwhelming Naval advantage, that limits the invasion to airborne attack, which is unlikely to be very successful on its own.
There are two nations that are pretty well guaranteed to be the first hit thanks to the lack of natural boundaries. Israel and Russia. Anyone can see that Israel is in a very big mess in the scenario. But its interesting to consider that Russia stands directly in the way of any proposed land invasion. Russia is the one selling them most of their military equipment, so how would this play out?
"It is well that war is so terrible, else we should grow too fond of it."
- General Robert E. Lee
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"It takes a big man to admit when he's wrong. I am NOT a big man." -Chevy Chase