Cuba once wanted to partner with USSR in hosting nuclear missiles (purely for defense purposes; you cannot invade with a missile) and US cared very much about it.
The USSR's support for Cuba went far beyond anything any NATO member has seen since the end of the Cold War, yet there was no war against Cuba.
Meanwhile, Central and Eastern Europe has seen no deployment of even conventional weapons beyond purely symbolic gestures like a few thousand lightly armed soldiers scattered across a region of more than 100 million people.
If Cuba is the blueprint, then NATO allies could arm Eastern Europe to the teeth.
Incidentally, US nukes in Turkey in 1960s was the starting point of the Cuban missile crisis.