Write a short, clear, factual news headline based on this article: The Pentagon last week designated Anthropic a supply chain risk, meaning companies must stop using Claude in the defence department.

Keir Starmer has said that a long-term US-Iran war would affect the “lives and households of everybody”, as the head of the AA advised motorists against making “non-essential” journeys.

On Monday, oil prices surged past $100 (£75) a barrel for the first time since 2022, which will feed through to higher costs at petrol stations, and consumers will also be hit if energy costs push up inflation.

Ministers are understood to be looking at ways to potentially mitigate the rising costs on energy bills – and are likely to come under pressure to cancel a planned 5p rise in fuel duty this autumn.

Speaking as he launched the government’s community cohesion plan, Starmer said: “The job of government is obviously to get ahead, to look around the corner, to work with others, and the chancellor speaks to the governor of the Bank of England on a daily basis … assessing the risks, monitoring and talking to our international partners as well about what more we can do together to reduce the likely impact on people here and businesses here, of course.

“But it is important to acknowledge that work is needed, because people will sense … that the longer this goes on, the more likely the potential for an impact on our economy, impact into the lives and households of everybody and every business.

“And our job is to get ahead of that, to look around the corner, assess the risk, monitor the risks, and work with others in relation to that.”

Edmund King, the president of the AA, said drivers should “not change their refuelling habits” but could “consider cutting out some non-essential journeys and changing their driving style to conserve fuel”.

Simon Williams, the RAC’s head of policy, said pump prices had “rocketed” in the last week. “Petrol is up 5p to 137.5p and diesel up 9p to 151p a litre since the current crisis began,” he said. “Unleaded is almost certainly going to reach an average of 140p in the next week or so while diesel looks highly likely to climb to at least 160p a litre.”

Most UK households will be protected in the short term by the energy price cap, but the UK’s reliance on gas from the Middle East makes it especially vulnerable to an effective blockade of the strait of Hormuz, through which about 20% of the world’s liquid natural gas is transported.

Starmer said the UK economy was in a stronger place than in 2022 when the war in Ukraine contributed to a surge in energy prices and overall inflation.

He said: “We’ve done a lot of work in the last 18 months to put some resilience in and make sure that we’ve got some headroom, which is basically some insurance within the economy, but also inflation is 3% and going down, so in that sense there’s more resilience.”

The prime minister’s statement followed a senior minister insisting that there was no immediate threat to energy supplies in the UK despite rising oil prices.