Supreme Court of Ukraine: illegal mobilisation is not an excuse to demobilise the person
Supreme Court of Ukraine: illegal mobilisation is not an excuse to demobilise the person

Встановлення факту незаконності мобілізації не призводить до звільнення незаконно мобілізованого з військової служби – Верховний Суд

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strictly from a legal point of view, certain administrative actions, if not made in accordance to law, can be convalidated, meaning that they can be corrected in their wrong bits and made legal (i don't know about the specifics of ukrainian administrative law, but they probably have something like that). from a political standpoint, however, this means that the war is getting problematic for them.