Japan clinched a landmark A$10 billion ($6.5 billion) deal on Tuesday to build warships for Australia, marking Tokyo's most consequential defence sale since ending a military export ban in 2014 as it steps away from postwar pacifism to counter China.

Japan’s Mitsubishi Heavy Industries won a multi-billion dollar deal to build a fleet of advanced naval frigates for Australia, boosting Tokyo’s ambitions to become a major exporter of military equipment and develop its defense sector.

Japan relationship has evolved rapidly in the past decade – and this could be threatened if something doesn’t go right with the deal.