With each passing day, the World Wide Web is becoming an outdated name.

Facebook warned on Monday that it would block users and news organisations in Australia from sharing local and international news stories on its social network and Instagram if the country passed a proposed code of conduct aimed at curbing the power of Facebook and Google.

The Australian Competition and Consumer Commission, the country’s top competition authority, is drafting a bill for parliament that would require both companies to negotiate with media publishers and pay them for content that appears on their sites.

Google also hinted that it might have to cut off its services in Australia in an open letter to users on August 17. Google said the government’s draft legislation would give large media companies “special treatment” so they could make unreasonable demands that would make it difficult to keep Google search and YouTube videos free.

Google, which owns YouTube, didn’t indicate how it would respond, but said its free services would be “at risk”.

The situation in Australia, while still playing out, demonstrates how government measures to diminish the influence of technology companies are creating digital fences between countries. While China has imposed restrictions on companies operating there for years, the US has shown a recent willingness to exercise exclusionary tactics on popular services from Chinese Internet companies.

The proposed changes in Australia could also contribute to the spread of disinformation, since news from legitimate news sources would be harder to find.

Over the past two months, the Trump administration has squared off against the Chinese government over the forced sale of ByteDance’s viral video app, TikTok, to an American technology company.

According to President Trump, ByteDance’s ties to the Chinese government are a national security risk to the US. The White House gave the Chinese company until September15 to divest its American assets or risk being shut down in the US.

Facebook said publishers and users in Australia trying to share news on its site would be greeted with a notification saying they were no longer able to do so and pointing to the legislation.

“The proposed law is unprecedented in its reach and seeks to regulate every aspect of how tech companies do business with news publishers,” said Will Easton, managing director of Facebook in Australia and New Zealand, in a company blog post on Monday eveningt.

Easton added that it would force Facebook to pay news organisations for content that the publishers voluntarily placed on its services.

In Australia on Tuesday, treasurer Josh Frydenberg said the government’s efforts followed an 18-month-long inquiry by the country’s competition authority. “Australia makes laws that advance our national interest,” he said in comments to The Australian Associated Press. “We don’t respond to coercion or heavy-handed threats wherever they come from.”

The proposals, Frydenberg added, “will help to create a more sustainable media landscape and see payment for original content”.

Facebook signalled that it would continue to make investments in news despite the decision, including expanding its Facebook News tab — a paid partnership programme dedicated to showing curated news stories inside the mobile app — to more countries and paid partners.

The company is also building more support for outside subscriptions into the product, including an account-linking feature that allows subscribers to stay logged in to their news accounts while reading articles on Facebook.

By taking aim at Google, whose dominant search engine is the gateway for information and news, and Facebook, the largest social network with billions of users, Australia’s regulator seeks to address what it calls “power imbalances” between news publishers struggling with the collapse of traditional media and conglomerates with thriving online ad businesses.