In this article, after explaining legal diplomacy, the solution of negotiation from within diplomacy, then by mentioning the challenges and international legal issues related to the case of the accident of flight number 752 of the Ukrainian passenger plane,

Therefore, it aims to answer the question that how can legal diplomacy and especially negotiation tools help to manage the tention in the relations between the mentioned governments and resolve the issues and challenges caused by the Ukrainian plane crash regarding the Iranian governments accountability, compensation and restoration of international trust? The hypothesis of the research is that the use of real diplomacy and conducting structured negotiations can pay compensation to the victims of the Iranian governments obligations and accountability, solve problems and solve problems and lead to the resolution of disputes and the reduction of diplomatic tentions between the parties.including multilateral negotiations, as facilitating and effective factors in resolving disputes showing the obtained results indicates that the use of legal diplomacy in solving the disputed problem is relatively useful and effective and the most efficient tool for solving the problem.

The present research uses the descriptive- analytical method and the necessary data has been collected through library and professorial methods. In the final part of this research, the nations of the failure of legal negotiations referred the case to the ICAO and issued a verdict.We have examined the Ontario Supreme Court( 2024) and finally we offer suggestions for conducting constructive and result-oriented negotiations and solutions to to resolve the issue.