Russian ones are: https://en.wikipedia.org/wiki/Nuclear-powered_icebreaker#List_of_nuclear-powered_icebreakers https://en.wikipedia.org/wiki/Nuclear-powered_ice

Russian ones are: https://en.wikipedia.org/wiki/Nuclear-powered_icebreaker#List_of_nuclear-powered_icebreakers https://en.wikipedia.org/wiki/Nuclear-powered_icebreaker#Lis... It probably would have been substantially more expensive for Australia to build and operate one, since nobody there has ever done it before. There's also supply chain risk - most nuclear reactor fuel comes from Russia at the moment, and none of it comes from Australia. There is uranium in Australia, but it would take a long time for them to start producing fuel themselves or develop a robust supply chain with a trusted trade partner.