Microsoft’s cybersecurity has detected a China-backed attack on U.S. communications infrastructure. The attack was targeted primarily in the U.S territory of Guam, a Pacific ocean island that is central to a potential U.S. response to Chinese aggression against Taiwan.

Microsoft published its analysis of the attack on its security blog earlier this week, identifying the culprits as Volt Typhoon, a state-sponsored hacking group in China.

Attempting to unravel Volt Typhoon’s goal, Microsoft stated its belief that the objective was to disrupt U.S. communications to the Pacific region.