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This seems naive. Ukraine was already invaded in 2014. I guess you are not from Eastern Europe when you deny these nation sovereignty.
Most prominently Russia claimed it won't invade Ukraine if Ukraine doesn't join NATO - Ukraine's NATO bid occured after Russia's full-scale invasion happened anyways.
Similar story with the nuclear disarmament of Ukraine.
One has to be especially gullible to trust Russia at this point.
The West has, with every decision, made the choice that put Ukrainian lives and sovereignty at risk starting from practically the day the wall fell.