[aguaviva]

We've seen the US throw a massive hissy fit in the Cuban Missile crisis because of Soviet gear in Cuba and that was much more benign than a full military integration.

Except there was no "full military integration" in the works, or even any "gear" deployed in Ukraine before Putin started throwing his massy hissy fit in 2014.

Because the major point of that infrastructure is to kill lots of Russians?

The point is to gently remind the current regime of the borders of NATO states, and of this thing known as Article 5 of the North Atlantic Treaty.