China PLA Navy AGI-797 Type 815A Electronic Intelligence Ship Confirmed in West Philippine Sea During Balikatan 2026 — SIGINT Collection on 7-Nation Allied Exercise Force

Post-exercise intelligence analysis published around May 12-14, 2026 confirmed that China's PLA Navy deployed a Type 815A Auxiliary General Intelligence (AGI) vessel, hull number 797, into the West Philippine Sea during Balikatan 2026 to collect signals intelligence (SIGINT) on allied military communications and electronic emissions. The Type 815A AGI-797 is among China's most capable electronic intelligence platforms, equipped with arrays of antenna systems, satellite uplinks, and wideband signal interception equipment capable of simultaneously monitoring multiple radio frequencies, radar emissions, and communication protocols. Positioned in international waters adjacent to the exercise area, the AGI-797 gave the PLA real-time access to allied coordination signals, communications patterns, radar signatures, and tactical data shared across the 7-nation, 17,000-troop exercise force — intelligence directly applicable to China's SCS contingency planning and electronic warfare countermeasures. The AGI-797 deployment is consistent with China's established practice of shadowing major US and allied exercises across the Indo-Pacific using 'legal' ELINT platforms. Its presence during Balikatan 2026 constitutes China's most direct electronic intelligence effort during any Philippine exercise and reflects the expanding scope of Beijing's multi-domain counter-exercise strategy alongside the PLA Task Group 107 live-fire drills east of Luzon (April 24-25), Liaoning carrier Taiwan Strait transit (April 20), Type 076 Sichuan South China Sea sea trials (April 22+), and CCG Chuanshan Scarborough Shoal training (May 9). Together these simultaneous PLA responses demonstrate a systematic capability to monitor, document, and calibrate against allied military readiness across electronic, naval, and administrative domains — all while remaining below the threshold for US Mutual Defense Treaty activation. The AGI-797 deployment is also directly relevant to the ongoing three-front SCS pressure campaign active as of May 14: Reed Bank research vessel standoff (Xiang Yang Hong 33, Day 8), Scarborough Shoal marine nature reserve dispute (no Chinese response to Philippine May 11 protest), and BRP Sierra Madre garrison at Second Thomas Shoal.