Questions are mounting in Canada and in Europe over whether big-ticket purchases of high-end U.S. weaponry, such as the F-35 Joint Strike Fighter, are still a wise strategic choice for Western countries worried about their investment in U.

The head of Canadian jet manufacturer Bombardier Inc. raised concerns about Canada’s decision to review a contract to buy dozens of F-35 fighter jets from Lockheed Martin Corp., the country’s latest response to the trade war with the US.

Canada, locked in a trade war with the United States, is reviewing a C$19-billion ($13.29 billion) contract for 88 American-made F-35 fighter jets from Lockheed Martin but switching planes could be costly and complex,