Why do you think leftists would give two shits about nations as if they were people? Leftism is an internationalist ideology.
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Because there’s people living in those countries.
Go on, write a letter to an imaginary 6yold niece of yours in Mariopol explaining why it’s better that she lives in a mafia-run police state, than for Ukraine to decide its own fate.
Also, states generally refuse to be poker chips, and they have all right to do so. Thus, by insisting that they be, you invariably create conflict.