I didn’t join, I just cooperated with Xiao, each got what they needed and used each other. Sasuke formed a separate team called "Eagle Squad"
Eagle Squad is a team recruited and formed by Sasuke. The three members are all special ninjas with rare abilities. When it was first formed, it was called "Snake" with the goal of killing Sasuke's brother, the genocide murderer Uchiha Itachi.
After Sasuke killed Itachi, he learned the truth about Itachi’s annihilation from “Uchiha Madara” (Uchiha Obito), so in order to avenge Itachi, he changed the “snake” into an “eagle”. The goal was also changed to destroy Konoha, and "Eagle" finally canceled its original goal with Sasuke's transformation during the Fourth Ninja War.
Extended information:
Origin——
The three-year deadline is approaching, and Orochimaru's body has reached its limit. Sasuke believed that Orochimaru, who was completely incapacitated, was weaker than him and there was no need to contribute his body, so he chose to kill Orochimaru. Just as Kabuto went to get Orochimaru medicine, Sasuke launched an attack on Orochimaru, and a battle ensued.
Orochimaru revealed his true form, and Sasuke also transformed into the second stage of the curse seal. The two fought from reality to a different space, and Sasuke saw the person whose body was occupied by Orochimaru's reincarnation. After Kabuto came back with the medicine, he was also sucked into a different space by Sasuke's Sharingan and witnessed the death of Orochimaru. Sasuke said the same thing to Orochimaru as Itachi at the end: "Orochimaru, no matter how strong you are, you are ineffective in front of these eyes."
After killing Orochimaru, Sasuke The people imprisoned by Orochimaru were released. He successively released Suigetsu, took away Xianglin, and then agreed to become Jonggo's prisoner and released him.
After the last four teamed up, they named themselves "Snake" and attacked Uchiha Itachi. After killing Itachi, Sasuke believed the truth told by the masked man. His anger and sadness made him open the kaleidoscope. chakra eye. He changed the name of "Snake" to "Eagle", and decided to kill the three high-ranking Konoha officials including Shimura Danzo, the mastermind behind Itachi's persecution, and to destroy Konoha who implemented the genocide policy against the Uchiha clan.