Can I transfer the apartment to the child instead of paying alimony?

YES, the law provides for such a possibility.

According to Article 190 of the Family Code of Ukraine, the parent with whom the child lives and the parent who lives separately from the child, with the permission of the guardianship authority, can conclude an agreement on the termination of the right to alimony for the child in connection with transfer of ownership of immovable property (residential building, apartment, land plot, etc.).

Such an agreement is notarized. The right of ownership of immovable property under such a contract arises from the moment of state registration of this right in accordance with the law.

However, according to part 3 of Art. 190 of the Family Code of Ukraine, the above does not exempt from the obligation to participate in additional expenses for the child.