Australian Foreign Affairs is published three times a year and seeks to explore – and encourage – debate on Australia’s place in the world and global outlook. "The uncomfortable reality is that preserving an exclusive sphere of influence in the South Pacific is not going to be possible against a regional power that is far stronger than any we have ever confronted, or even contemplated." HUGH WHITE The sixth issue of Australian Foreign Affairs examines Australia's struggle to retain influence among its Pacific island neighbours as foreign powers play a greater role and as small nations brace for the impacts of climate change. Our Sphere of Influence explores the security challenges facing nations in the southern Pacific and whether Australia will need new approaches to secure its relations and interests. Hugh White argues that Australia will be unable to keep China out of the Pacific and must urgently renew its defences. Jenny Hayward-Jones examines whether Scott Morrison's Pacific "step-up" can reverse Canberra's declining diplomatic influence. Katerina Teaiwa explores how Australia's climate change policy undermines ties with its island neighbours. Sean Dorney reports from inside the forgotten Australian colony of Papua New Guinea. Euan Graham proposes how to address Australia's knowledge gaps about the Chinese leadership and military. Elizabeth Becker reflects on the unique challenges for female foreign correspondents. PLUS Correspondence on AFA5- Are We Asian Yet? from Clive Hamilton, Barry Li and Linda Jaivin.