China has called for dialogue with the Philippines after the Philippine Coast Guard drove away a Chinese research vessel operating off the province of Batanes. Beijing framed the appeal as a call to settle 'maritime differences' and to end what it described as interference in its marine research activities. A spokesperson demanded that Manila respect China's claimed sovereign rights and jurisdiction over the waters in question. The Philippine side treats such survey ships as intruders, since marine scientific work inside its waters requires Filipino consent. Batanes lies close to the Luzon Strait, a stretch of sea where Chinese ship traffic has grown and Filipino patrols have pushed back in recent months. The exchange fits a familiar pattern in which incidents on the water are followed almost immediately by offers of talks from Beijing. Each round leaves the Philippines balancing coast guard action against the risk of escalation, while ASEAN keeps struggling to agree rules of conduct. Fishing communities in Batanes care most about where they can safely work their grounds, a question the diplomatic language never quite answers.