The United States and partner militaries have launched the largest edition of the Rim of the Pacific exercise, bringing together more than 40,000 troops in a show of coordination across the Indo-Pacific. The drills began on Friday and are designed to strengthen joint readiness among allies and partners in a region facing rising security pressure.

According to Reuters, the exercise comes as concerns persist over China’s military posture around Taiwan and in the South China Sea. The scale of the operation underscores how Washington and its allies are responding to a more contested regional environment with larger, more complex training drills.

RIMPAC is held regularly, but this year’s version is the biggest ever. Officials involved in the exercise say the focus is on interoperability, deterrence, and preparedness in the event of a crisis at sea or near strategic shipping lanes.

The drills are taking place against a backdrop of heightened geopolitical rivalry, with Taiwan remaining a major flashpoint. For regional governments, the exercise is both a military test and a signal that the US and its partners intend to maintain a visible presence in the Pacific.