Bern chose Lockheed Martin's F-35A Lightning II as its next-generation fighter plane in 2021, with a fixed price of around 6 billion Swiss francs ($7.44 billion) for 36 jets, a decision that attracted controversy in Switzerland.

Switzerland was informed the price for the F-35s would be dearer because of higher raw materials and energy costs, as well as higher US inflation, with the sum potentially increasing by $650 million to $1.

Switzerland and the US are at odds on the agreed price for three dozen F-35A fighter jets the country wants to buy from Lockheed Martin Corp., adding to existing tensions over US tariffs.