Why is Putin/Russia okay with Poland being in NATO but not Ukraine as they are both bordering neighbors of similar size?

Oliver St John, Writer. Songwriter. Programmer. Soccer fan. Much more. • Answered March 3

Okay, brace yourself for this, because it might shock you.
 
Are you sitting down?
 
Good.
 
So....
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Why is Putin/Russia okay with Poland being in NATO but not Ukraine as they are both bordering neighbors of similar size? 3_eaay31