The United States will sell 12 F-35A aircraft, which can carry nuclear bombs, to the United Kingdom.
As he urges NATO countries to do more to help the alliance, British Prime Minister Keir Starmer will make the statement during Wednesday's NATO meeting.
The announcement comes after US President Donald Trump has repeatedly criticized NATO nations for their inadequate security spending.
One of the most sophisticated fighter jets in the world, the fifth-generation fighter is also one of the priciest. It is mostly manufactured by the US company Lockheed Martin.
Britain's nuclear posture has also been significantly strengthened by the decision to purchase planes that can carry nuclear weapons.
The country will purchase 12 nuclear weapon-capable F-35A fighters, in the "biggest strengthening of the UK's nuclear posture in a generation," Downing Street said, adding Starmer would announce the plan at a NATO summit.
"These F35 dual capable aircraft will herald a new era for our world-leading Royal Air Force and deter hostile threats that threaten the UK and our Allies," Starmer says.
NATO Secretary General Mark Rutte was quoted in the statement as saying: "I strongly welcome today's announcement," calling it "yet another robust British contribution to NATO."
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At that time, "there was no longer any real interest in tactical nuclear weapons in Europe, because the threat had disappeared," Heloise Fayet, a nuclear specialist at the French Institute of International Relations (Ifri), told Agence France-Presse.
She said Tuesday's announcement illustrates "the continued re-nuclearization of Europe, the renewed need for nuclear weapons, and the strengthening of NATO's deterrence, in the face of an adversary, Russia," which has been at war with Ukraine for three years.
This means that the UK will now be a part of NATO's dual capable aircraft nuclear mission in addition to its current seaborne nuclear deterrent.
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With 15 percent of the worldwide supply chain for the jets situated in the UK, the decision will support 20,000 employment in the F35 program in the UK, according to the British government.