Inadmissibility of the performance of an obligation by a third party in legal relations that are not of a personal nature

In practice, there are three main models for the participation of a third party in the performance of the debtor's obligations to the creditor. A third party can fulfill obligations: on their own motivation by virtue of a normative act by virtue of an agreement with the debtor. However, despite the lack of a personal nature of such obligations and the connection of the personality of the debtor or creditor with the essence of the obligation, the problem often arises of the impossibility of its performance by a third party. This problem is analyzed in this article from the standpoint of current law enforcement practice.