On Thursday, the leaders of the three countries went out and announced that the cooperation, which goes by the name Aukus, will strengthen the ties between the countries.

- We all realize the importance of ensuring peace and stability in the region over a long period of time, says US President Joe Biden.

The "region" that Biden talks about is the strategically important area Indo-Pacific.

At the same time, China is upgrading its fleet.

- This is about the US's role in this part of the world, the Pacific and the Indian Ocean, the oceans near China, you might say, says SVT's foreign reporter Tilde Lewin.

Hear SVT's foreign reporters explain why the Aukus triad is formed.