Canada has finalized an agreement with Lockheed Martin Corp and the United States government to purchase 88 F-35 fighter jets, government officials said Monday.

The first four aircraft are anticipated to be delivered in 2026 with full operational capacity for the fleet expected between 2032 and 2034.

The government said last year Lockheed Martin’s F-35 was deemed to be the top-ranked bidder for a new fighter jet.

The government has budgeted about $19 billion Canadian (US$15 billion) for the purchase in what is the largest investment in the Royal Canadian Air Force in more than 30 years. Each jet costs about US$85 million. The full life cycle of the program is expected to cost $70 billion (US$52 billion)

Canada has a close defense relationship with the United States, which includes using fighter jets together to defend North American air space. The announcement comes as Trudeau is set to meet with U.S. President Joe Biden at the North American Leaders’ Summit in Mexico.

Before becoming prime minister, Trudeau said Canada wouldn’t buy the F-35. A former Conservative Canadian government had announced the purchase of the F-35 but Trudeau’s Liberal government delayed that purchase and opened up the bidding to competition.

“As our world grows darker with Russia’s illegal and unjustifiable invasion of Ukraine, and China’s increasingly assertive behavior in the Indo-Pacific, this project has taken on heightened significance especially the importance of interoperability with our allies,” Defense Minister Anita Anand.

“We need to ensure that especially in this changing global strategic environment we are that we are fulfilling our obligations to NORAD and to NATO.”

Canada previously ruled out the Boeing’s Super Hornet to replace aging F-18s. Instead, Canada purchased some Australian F-18s to help extend the life of the Canadian F-18 program until 2032.

(AP)