Asia's top security summit, hosted in Singapore, opens against a backdrop of mounting geopolitical tensions and questions about US priorities in the region. SINGAPORE: Defence leaders, military chiefs and security experts from around the world are gathering in Singapore for the Shangri-La Dialogue, Asia’s top security summit , which begins on Friday (May 29). Held against a backdrop of heightened geopolitical tensions, the annual meeting comes amid conflicts in the Middle East and Europe , as