---
title: "AUKUS Pact Definition and Overview | Model Diplomat"
description: "AUKUS is a 2021 trilateral security partnership between Australia, the UK, and the US, focused on nuclear-powered submarines and advanced defense tech."
url: "https://modeldiplomat.com/learn/glossary/aukus-pact"
---

[New](https://modeldiplomat.com/)

#

Model Diplomat Research Team · Last reviewed June 22, 2026

TL;DR

- AUKUS is a 2021 trilateral security partnership among Australia, the United Kingdom and the United States, centred on supplying Australia with nuclear-powered submarines and advanced defence technologies.
- How does AUKUS differ from the Quad?
- Does AUKUS violate the Nuclear Non-Proliferation Treaty?
- Why did France react angrily to AUKUS in 2021?
- What are the two pillars of AUKUS?

[Civil Service & Diplomatic Exams](https://modeldiplomat.com/learn/civil-services/glossary)Updated June 22, 2026

Go beyond the definition

## Research AUKUS pact like a delegate

Model Diplomat's AI drafts position papers, speeches, and country research with real sources — built for MUN and politics students.

## Timeline

1. 15 September 2021

   AUKUS is an enhanced trilateral security partnership announced on by Australian Prime Minister Scott Morrison, British Prime Minister Boris Johnson and US P…

2. 13 March 2023

   Pillar One delivers the submarine capability: under the "Optimal Pathway" announced on in San Diego, Australia will buy three to five US Virginia-class SSNs…

## Research it like a delegate

Research on modeldiplomat.com

## Ask a follow-up about AUKUS pact

Open a cited briefing in Model Diplomat search — timelines, positions, and sources you can use in committee or exam answers.

[Start research on AUKUS pact](https://modeldiplomat.com/search?q=Explain%20AUKUS%20pact%20%E2%80%94%20key%20dates%2C%20actors%2C%20positions%2C%20and%20sources)

Example

In March 2023, US President Joe Biden, Australian PM Anthony Albanese and UK PM Rishi Sunak unveiled the AUKUS "Optimal Pathway" in San Diego, committing Australia to acquire Virginia-class submarines from the early 2030s.

Keep learning

## Go deeper than the definition

Lessons

[Rise Of Asia The Contemporary Multipolar Order](https://modeldiplomat.com/learn/lessons/exam-world-history-rise-of-asia-the-contemporary-multipolar-order)

Courses

[Exam World History](https://modeldiplomat.com/learn/courses/exam-world-history)

[Explore all Civil Service & Diplomatic Exams lessons](https://modeldiplomat.com/learn/civil-services)[Test yourself with a quiz](https://modeldiplomat.com/learn/glossary/quiz/civil-services)

## Take AUKUS pact beyond the glossary

Ask the AI research engine built for diplomacy — get briefings, position papers, and speeches with sources you can cite in committee.