The United States is planning to cut crucial military contributions available to Europe should members of the Nato alliance be called to action.
The move would see fighter jets, warships, and strategic bombers becoming less readily available when needed.
US Defence Secretary Pete Hegseth reportedly briefed top officials at the Nato headquarters last week, according to German outlet Der Spiegel.
The framework would see Washington cutting its commitments to the Nato Force Model, which sets out how national forces are made available to alliance members in times of crisis or conflict.
US Envoy Alexander Velez-Green seemingly said during the behind-closed-doors meeting the US would be cutting fighter jet commitments by a third, while the US Navy will be making fewer destroyers available.
He also added the US would no longer provide any submarines to Europe.
The changes mean that Europe would have to provide its own reconnaissance drones.
Refuelling aircraft, which are crucial to long-range missions, are also at risk under the new plans.
The US is set to slash military support for Nato in times of crisis
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European intelligence agencies have warned that a large-scale attack on Nato allies could be seen in just a few years.
Nato chief Mark Rutte said in December that allies “must be prepared for the scale of war our grandparents or great-grandparents endured.”
Russia has repeatedly denied intelligence reports regarding its intentions as hysteria.
A spokesman for Nato told Der Spiegel that allies had an “over-reliance” on the US, and that Europe and Canada will be investing more in defence and military responsibilities to reorganise.
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The US is planning to withdraw fighter jets alongside other key defence aids from Nato
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When asked on Friday, Mr Rutte declined to give details on the reports.
He said that the US contributions to Nato’s Force Model were being discussed, with the US “cannot be everywhere at the same time.
He continued: “Of course, this is highly classified because we don’t want to make anyone any wiser, but this is a process in place, this is nothing new.
“We know that the US has to think: if you have multiple threats, how can we make sure that all the capabilities and all the key enablers are everywhere where we need them.”
The US president, Donald Trump has slammed Nato in recent weeks.
Mr Trump said he recently received a phone call from Nato offering support in the Strait of Hormuz.
Mr Trump said: "Now that the Hormuz Strait situation is almost over, I received a phone call from Nato asking if we would like some help. Thank you very much Nato.
"And I told them I would have liked your help two months ago, but now I really don't want your help anymore because they were absolutely useless when we needed them."
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