The United States plans to significantly reduce the aircraft and warships that it makes available for NATO operations in Europe, according to two senior European officials, accelerating America’s effort to scale down the protection it has offered to European allies for eight decades.

The decision would limit NATO’s ability to launch long-range strikes and conduct surveillance. It was communicated to allies in early June in a written document, parts of which were reviewed by The New York Times. The European officials, who were briefed on the decision, spoke on the condition of anonymity to speak more freely about sensitive military plans.

The planned drawdowns include:

• Reducing the number of F-16 and F-15E fighter jets from roughly 150 to 100

• Reducing maritime reconnaissance aircraft from 26 to 15 and cutting all eight aerial refueling tanker jets previously available to Europe

• Reallocating a missile-launching submarine and an aircraft carrier, along with several warships and scores of jets that join the carrier’s missions

• Reallocating one of two groups of bombers previously assigned for Europe’s defense

The Pentagon declined to comment on the specific numbers in the document, and referred to a statement by its European Command last week that spoke in general terms of its intention to reduce its commitments in Europe.

These details, some of which were first reported in the German news outlet Die Welt, provide the clearest picture yet of the extent to which the Trump administration intends to reduce its commitment to NATO, a military alliance created in the aftermath of World War II. NATO’s purpose was mainly to protect American allies in Europe from external threats like the Soviet Union, and its European members still see it as essential to their ability to deter Russia.

The Pentagon has not yet publicly revealed the timeline for the drawdown but American officials have indicated it will take effect very soon — far earlier than European counterparts had been preparing for. The abrupt cutoff of American forces would affect NATO’s ability to, for example, monitor Russian submarine traffic or launch long-range Tomahawk missiles deep into Russian territory.

Though Europeans have similar missile-launching capabilities, experts say that the missiles act as a bigger deterrent to Russia when wielded by the United States, since Europeans may be warier of deploying them.