AUKUS is not only an important geo-political tool for the US，but also an enabler for the UK to maintain and expand its international influence in the Indo-Pacific region in the post-Brexit era. Thus，AUKUS will further bind the UK to the US’s Indo-Pacific strategy and China policy，and entangle the UK in the security competition of the Asia-Pacific and Indian Ocean region in the foreseeable future. It marks that the US，the UK and Australia，as three major Anglo-Saxon sea-powers with similar strategic traditions，begin to reiterate the “insular principles” and control four oceans（Pacific，Atlantic，Indian，and Arctic）to maintain their Anglo-Saxon global maritime hegemony. Therefore，the establishment of AUKUS may exert a direct impact on the security order in the Asia-Pacific and Indian Ocean region，pose a severe challenge to the global nuclear non-proliferation cause，and make a fundamental change in the strategic relations between major countries and the world order.