Are there any prohibitions or restrictions on the sale of land in certain areas?

Yes, there is.

According to Clause 14-1 of Section X of the Land Code of Ukraine, the alienation of land shares (shares), state and communal property for agricultural land, the alienation and change of purpose of privately owned agricultural land plots allocated in kind (on site) to the owners of land shares are prohibited (shares) located in the temporarily occupied territories in the Donetsk and Luhansk regions, the Autonomous Republic of Crimea and the city of Sevastopol, except for their inheritance. Agreements (including power of attorney) entered into during the period of the ban on the purchase and sale or alienation in another way of land plots and land shares (shares) specified in this clause, in terms of their purchase and sale and alienation in another way, as well as in terms of the transfer of rights to alienate these land plots and land shares (shares) for the future, are invalid from the moment of their conclusion (certificate).