...is this power of attorney valid today, or is it canceled after the death of the owner?
...is this power of attorney valid today, or is it canceled after the death of the owner?
Yes, it is cancelled.
In accordance with Clause 6, Part 1, Art. 248 of the Civil Code of Ukraine, representation by power of attorney is terminated in the event of the death of the person who issued the power of attorney, declaration of his death, recognition of his incapacity or unknown absence, limitation of his civil legal capacity.