Canada

Parliament can cancel a contract at any time, for any reason, with no financial penalties, and it's likely there's a clause in the contract itself whereby the minister can do this even without parliament. That's why many of the discussions revolve around whether Canada should go ahead with all 88 jets or just the 16(?) we have ~~already paid for.~~ edit: article says "financially committed to", so I'm not 100% sure we've paid already. If not, then yeah I'm pretty sure we can cancel the whole thing if we want to

Here's the relevant part of the procurement laws https://laws-lois.justice.gc.ca/eng/acts/d-1/page-2.html#h-171862

See section 21 which reads as follows:

Premature rescission, resolution or termination of contract

21 No person is entitled to damages, compensation or other allowance for loss of profit, direct or indirect, arising out of the rescission, resolution or termination of a defence contract at any time before it is fully performed if it is rescinded, resolved or terminated under a power contained in the contract or under a power conferred by or under an Act of Parliament.