Chapter 192:
The Village Hidden in the Clouds is well known for its intense focus on studying secret techniques. Right now, they're particularly invested in researching ways to control their Jinchuriki.
The last time the Third Hokage requested assistance from Kumo, one of their sensory-type ninjas had visited Konoha. Initially, their visit had no ulterior motives. However, during their stay, this perceptive ninja made an unexpected discovery: Uzumaki Kushina, a young girl with the unique ability to suppress the chakra of tailed beasts.
When they returned, this revelation was reported to the Third Raikage. After discussing the matter, Kumo's leadership made the decision to take advantage of their alliance with Konoha and visit again, this time with the intent to capture Kushina to aid in their research for controlling Jinchuriki.
What about the consequences of such an action on the alliance? At this point, they didn't care. Kumo's ambition to strengthen their power trumped any political ties. If their Jinchuriki could fully control the tailed beasts, then alliances were inconsequential.
Thus, they came back with a plan already in place.
In the original timeline, this event would lead to Kushina being kidnapped by the Kumo ninja, only for Minato to heroically rescue her. That act of bravery would spark a deeper bond between them, eventually leading to their marriage and the birth of Naruto Uzumaki, the destined hero of Konoha.
But Orochimaru wasn't going to let Minato have that opportunity. This situation was too valuable for him to ignore. He could use it to his advantage to get closer to Kushina. If someone else was going to attempt the kidnapping, why not leverage that situation?
With that thought, he had made his move. Orochimaru found the perfect chance to bug and place hidden cameras in the Kumo ninja's guest room, all under their noses. For extra insurance, he had even planted a couple of invisible monitoring insects for a complete view of their plans.
Kumo ninjas, focused on conventional surveillance techniques, were clueless about Orochimaru's advanced, subtle monitoring methods. Every detail of their plan had been recorded by him.