Core Viewpoint - Apple and Samsung have jointly issued a legal notice to Xiaomi, demanding the cessation of controversial marketing practices that allegedly harm their brand image [1] Group 1: Legal Actions - Apple and Samsung claim that Xiaomi's marketing strategy in India, which mocks the iPhone 16 Pro Max and Samsung's flagship models, constitutes "sneak attack marketing" [1] - The legal notice specifically addresses Xiaomi's advertising during the launch of the Xiaomi 15 series, where it directly referenced and ridiculed the camera performance of competitors [1] Group 2: Company Responses - Xiaomi has not yet responded to inquiries regarding the legal notice from Apple and Samsung [1]