The US is threatening #Canada (again) if we don't but their F-35s. Here's what Denmark said about the ones they bought, and regret buying:
"They're in for repairs about half the time or even more," he said, "so the Americans have all the power of actually destroying our air force just by shutting down [parts] supplies."
https://www.cbc.ca/news/politics/norad-canada-us-f35-9.7059800