> ...and how did that help solve the "european version of carribian crisis"?
Well it didn't, and that's my point. This was the diplomatic route and it completely failed. There was never going to be a diplomatic solution.
> there were attempts to make safeguards - to allow Ukraine into EU, but not NATO. Those failed
Yes, in 2013 Ukraine signed a trade deal with the EU and already at that time Russia pressured Ukraine to renounce this deal. Russia showed their hands at that point and clearly displayed to the world that it had nothing to do with NATO but rather about total control of Ukraine.
> War is the result of those failures
War started 11 years ago, after Euromaidan, at a time where Ukraine wasn't talking about joining NATO yet. NATO became a priority for Ukraine in response to the Russian invasion in 2014.
...and how did that help solve the "european version of carribian crisis"?
ignoring reasons citing costs only expresses you having different values - but it doesn't solve the problem
there were attempts to make safeguards - to allow Ukraine into EU, but not NATO. Those failed
War is the result of those failures