Switzerland is engaged in discussions with the United States after American officials signaled a possible price increase for the fleet of fighter jets Bern agreed to purchase, the Swiss government said Wednesday.

The Swiss government has begun negotiations with its U.S. counterparts over a potential $1.3 billion increase in the price of the country’s new fleet of Lockheed Martin F-35 Joint Strike Fighters. When Bern signed the letter of offer and acceptance for the 6.035 billion Swiss francs ($6.25 billion)...

Switzerland is seeking talks with the United States, the government said on Wednesday, after Washington tried to raise the price for new fighter jets the neutral country is buying to upgrade its air defences.