The Quad grouping was originally formed in 2004 in response to the Indian Ocean tsunami for humanitarian relief efforts. It brought together India, US, Australia and Japan for naval coordination. Though the effort transitioned to the UN, the idea of strategic cooperation in the Indo-Pacific region had taken hold. The Quad grouping was revived in 2017 amid shared concerns about China's growing military assertiveness. While differences remain among members, China's recent aggressive actions on its borders and in the South China Sea have increased the prospects that India will deepen its cooperation within the Quad, with significant implications for regional and global security.