The country is struggling to contain a resurgent coronavirus pandemic just three months out from the Tokyo Olympics.
The first leader Joe Biden welcomed to a face-to-face meeting at the White House was Japan’s Prime Minister.
Organisers are racing to establish contingency plans,spectator limits,coronavirus testing protocols for athletes and book out hotels to isolate infected participants.
It’s too early to tell if the grouping of India,Australia,Japan and the US will be as important as NATO but the grouping is picking up momentum.
COVID-19 cases have surged in Tokyo and surrounding areas to the highest levels since the beginning of the pandemic.
The rescheduled Olympics and Paralympics will go ahead this summer despite a surge in coronavirus cases in Japan,the country's prime minister has declared.
Japanese PM Yoshihide Suga has so far sought to balance Japan's deep economic reliance on China with addressing security worries,including Beijing's disputed claims in the East China Sea.
The two nations will now look to increase their military co-operation in a number of key waterways,including in the South and East China seas.
Scott Morrison also said Australia shared Japan's ambition of achieving net-zero emissions but he was focused on"how we get there and how that can be achieved"before he committed to those targets.
This week's visit to Tokyo by Prime Minister Scott Morrison will strengthen Australia-Japan ties at a very significant geopolitical moment.
Scott Morrison will push for Japan to take Australian hydrogen during a trip to Tokyo where he will meet with new Prime Minister Yoshihide Suga for the first time.