Drain assembly with no nut underneath?

Hi, my drain assembly corroded and started leaking. I’ve removed the p trap but there’s no nut holding the drain assembly on underneath the sink. Can’t see a way to remove it at all. Anyone know how to remove this thing?

Advice from 2 local tradespeople

It may have been glued on if there's no nut. Usually any basin or bath waste would have a nut underneath

If your corroded drain assembly has no nut underneath, it's likely stuck due to rust/calcium buildup, meaning you'll need pliers (channel locks), penetrating oil, or possibly a hacksaw to cut it off, as it's often fused to the sink tailpiece; first remove the stopper linkage, then grip and twist the large locknut (or basket strainer body) from below, using vinegar to loosen mineral deposits if needed.

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