Australia said on Friday it would pump an additional US$3.2 billion into building the country’s nuclear-powered submarines, part of a controversial defence pact with the United States and Britain.Under the 2021 Aukus deal, Australia’s most expensive defence project, the country will receive three nuclear-powered submarines from the United States. Australia and Britain will then build a new class of submarine in the 2040s.But the deal has faced scrutiny over whether slow submarine production...