LONDON (AP) — British Prime Minister Boris Johnson on Thursday backed what is being touted as the biggest investment in the U.K.'s armed forces since the end of the Cold War three decades ago, brushing aside whether his government is about to abandon pledges on overseas aid spending.

Johnson told lawmakers that the four-year financial package for the Ministry of Defense will "end the era of retreat” and pivot Britain's military toward potential future threats. For example, the new money will fund space and cyber-defense projects such as an artificial intelligence agency.

In an address given remotely because he came into contact with someone who subsequently tested positive for the coronavirus, the prime minister said the armed forces will receive an additional 16.5 billion pounds ($21 billion) over and above the government's earlier plan.

“For decades, British governments have trimmed and cheese-pared our defense budget, and if we go on like this, we risk waking up to discover that our armed forces, the pride of Britain, have fallen below the minimum threshold of viability," Johnson said.

“Based on our assessment of the international situation and our foreign policy goals, I have decided that the era of cutting our defense budget must end, and it ends now.," he said.

Since the end of the Cold War in the early 1990s, Britain, like many other Western countries, cut defense spending in order to reap a peace dividend. And while the U.K. was deeply involved in the wars in Afghanistan and Iraq, its armed forces have faced further budget cuts in the past decade as successive Conservative governments clamped down on spending to get the public finances into shape following the global financial crisis.

Johnson said the new money will help protect “hundreds of thousands” of jobs and create 40,000 new ones, with the returns going “far beyond our armed forces.” He said the defense funding will “restore Britain’s position as the foremost naval power in Europe” and “spur a renaissance” in British shipbuilding.

Political leaders from across the political spectrum gave a guarded welcome to the prime minister's announcement. Many, including Keir Starmer, the leader of the main opposition Labour Party, wondered where the money was coming from at a time when public finances have been battered by the costs associated with the coronavirus pandemic.

Starmer and others voiced concerns in particular that the government is about to abandon its commitments on overseas aid to pay for the higher military spending. The government has already rolled the department overseeing overseas aid into the Foreign Office. Some in government have argued for a reduction in the commitment to maintain aid spending at 0.7% of national income, which could free up billions of pounds for use elsewhere.

“He (Johnson) must know that if he breaks it, that will not only undermine public trust, but also hugely weaken us on the global stage," Starmer said.

Johnson wouldn't say directly whether the government is set to abandon its financial commitments to the world's most needy people, but his comments appeared to signal a change in approach at the very least.

“We can all be proud of our record on overseas aid and that will continue, but it's also by investing in armed services that you can do some of the greatest things for the poorest and neediest people around the world," he said.

More details will likely emerge next week when Treasury chief Rishi Sunak unveils details of the country's spending plans for the coming year.