This study came with an introduction and three sections, results and recommendations. The introduction included the problem of the study, which sheds light and confirms the Israeli strategy for the secession of South Sudan and its subsequent effects that may represent a threat to both Egyptian and Sudanese national security.      The study also clarified in the first chapter the extent of Israeli relations with the leaders of South Sudan before secession, through a historical overview of those relations that existed between Israel and the rebel movements. The study demonstrated the ongoing dispute between the North and the South since British colonialism and clarified the role of colonialism in laying the foundation for that separation.     The study also clarified the role of the Sudanese elites in helping Israel to intervene in the affairs of the Democratic Republic of Sudan at the hands of some parties at that time. In a more comprehensive sense, Sudan was experiencing one of the most difficult periods, whether before or after independence, and the lack of stability can be explained by the inability to reach an agreement. There was an agreement to find a compromise solution, and the elite that seized power did nothing to address the crisis in the country except for resorting to a military coup as a solution to political differences. The turn to Israel was the result of the desire of some Sudanese politicians to retain power and not give it up, so that was the driver of this trend.      This intervention is not the first for Israel. When we look at the Renaissance Dam in Ethiopia, we see behind the construction of that dam an Israeli intervention to keep the Renaissance Dam located in Ethiopia as a thorn that Israel planted in the upper reaches of the Nile River. The separation of South Sudan from the State of Sudan is considered a bomb. Geo-strategy threatens Egyptian national security. Considering that South Sudan is a good gateway to the east and west of the continent, where Israel can build bases to monitor, follow up, and spy on neighboring countries, this represents a great threat to Egyptian national security.