The new Royal Navy submarine HMS Astute can be seen at sea.

BBC- The UK, US and Australia have announced a historic security pact in the Asia-Pacific, in what’s seen as an effort to counter China.

It will let Australia build nuclear-powered submarines for the first time, using technology provided by the US.

The pact, to be known as Aukus, will also cover artificial intelligence, cyber and quantum technologies.

It is the biggest defence partnership among the countries in decades, analysts say.

China’s embassy in Washington reacted by accusing the countries of a “Cold War mentality and ideological prejudice”.

In recent years, the Western democracies have all expressed concerns about China’s growing military assertiveness.

The new partnership aimed to “promote security and prosperity” in the region, said US President Joe Biden, UK Prime Minister Boris Johnson and his Australian counterpart Scott Morrison in a joint virtual press briefing.

But in one awkward moment, Mr Biden appeared to forget Mr Morrison’s name, referring to him as “that fellow down under”.

The pact means Australia has torn up a A$50bn (€31bn; £27bn) deal it signed with France in 2016, to build 12 submarines.

What is Aukus?

It is probably the most significant security arrangement between the three nations since World War Two, analysts say.

The pact will focus on military capability, separating it from the Five Eyes intelligence-sharing alliance which also includes New Zealand and Canada.

While Australia’s submarines is the big-ticket item, Aukus will also involve sharing of cyber capabilities, AI, quantum and other undersea technologies.

“This is an historic opportunity for the three nations, with like-minded allies and partners, to protect shared values and promote security and prosperity in the Indo-Pacific region,” the joint statement read.

The leaders did not refer to China directly, but said regional security challenges had “grown significantly”

“This really shows that all three nations are drawing a line in the sand to start and counter [China’s] aggressive moves in the Indo-Pacific,” said Guy Boekenstein from the Asia Society Australia.

What’s the background?

China’s military build-up and increasing aggression has worried rival powers in recent years.

Beijing has been accused of raising tensions in disputed territories such as the South China Sea.

It has also invested heavily in its military capacity, including its Coast Guard which some analysts argue has become a de facto military fleet.

Western nations have been wary of China’s infrastructure investment on Pacific islands and also criticised China’s trade sanctions against countries like Australia.

Australia had in the past maintained good relations with China, its biggest trading partner.

But the relationship has broken down in recent years amid political tensions.

Why nuclear-powered submarines?

These submarines are much faster and harder to detect than conventionally powered fleets. They can stay submerged for months, shoot missiles longer distances and also carry more.

Having them stationed in Australia is critical to US influence in the region, analysts say.

The US is sharing its submarine technology for the first time in 50 years. It had previously only shared technology with the UK.

Australia will become just the seventh nation in the world to operate nuclear-powered submarines, after the US, UK, France, China, India and Russia.

Its contract with France had been hit by delays due to Canberra’s requirement that several components be locally sourced.

Australia has reaffirmed it has no intention of obtaining nuclear weapons.

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What’s been the reaction?

China’s embassy spokesman in Washington said nations “should not build exclusionary blocs targeting… the interests of third parties”.

French officials said Australia’s reneged deal showed “a lack of coherence that France can only note and regret.”

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Meanwhile New Zealand said it would ban Australia’s submarines from its waters, in line with an existing policy on the presence of nuclear-powered submarines.

New Zealand, although a Five Eyes member, has been more cautious in aligning with either the US or China in the Pacific.

Prime Minister Jacinda Ardern said her nation had not been approached to join the pact.