How to properly ensure legal purity when buying a plot of land...?

You need to consider the following.

Until December 31, 2023, only natural persons-citizens of Ukraine will have the opportunity to conduct operations on the purchase and sale of land, however, their volume cannot exceed 100 hectares per person.

From January 1, 2024, legal entities will be able to purchase agricultural land with a limit of 10,000 hectares.

However, this opportunity will be available only to Ukrainian companies whose participants or shareholders are exclusively citizens of Ukraine, the state or territorial communities. Foreigners, stateless persons and foreign legal entities will be able to use this right only if Ukrainians support such a decision in a referendum.