Former Official Recommends Australia Explore Leasing Submarines from Japan as AUKUS Backup

A former senior Australian defense official has recommended that Australia consider leasing conventionally powered submarines from Japan as a backup option if challenges arise with the AUKUS nuclear-powered submarine pact. The suggestion was made in a report for the Australian Strategic Policy Institute, amid preparations for a meeting between the Australian prime minister and Japan's prime minister in Canberra on Monday.

Japan's prime minister, who arrived in Canberra late Sunday, is set to discuss with the Australian prime minister ways to strengthen economic security, including securing energy and gas supplies following the closure of the Strait of Hormuz. The leaders are also expected to address partnerships on critical minerals to reduce risks of economic coercion by China.

A former Japanese ambassador to Australia stated that the leaders should coordinate to ensure the Trump administration maintains focus on the Indo-Pacific region and prevents any power vacuum that Beijing could exploit.

Richard Gray, who held senior defense roles including deputy director of defense intelligence, proposed that Australia request Japan's assistance for a 'plan B' in case of hurdles with AUKUS. Gray highlighted risks in extending the life of Australia's ageing Collins-class submarines, acquiring Virginia-class submarines from the United States, and developing a new nuclear-powered class with the United Kingdom.

He suggested leasing small numbers of advanced conventional submarines from Japan to bridge any capability gaps. Japan operates a fleet of 24 diesel-electric attack submarines, including seven Oyashio-class, twelve Sōryū-class, and five Taigei-class vessels, with active production lines capable of producing one advanced submarine per year and potential for increased output.