This, is arguable the biggest single potential escalation since the day Russia invaded Ukraine last year. A terrible idea that could potentially cause serious escalation.
If the new Moldovan government want to try and take Transnistria then do it after the Ukraine/Russia war has ended for gods sake >.>
Well lets flip it around for you.
Remember 85 odd years ago when Russia was being conquored by Germany and the west gave then the arms/supplies they needed to avoid defeat. Would you have considered it okay if say Spain and Japan had started supplying Germany so they could take Moscow/Leningrad?
There's nothing wrong with aiding the bullied in defending themselves from bullies, there is something wrong with helping the bullies.