I think we can pretty much rule this out for Canada, absent a drastic change in US-Canada relations:
"Strikingly, Canada appears to have even refused an offer which would have seen the USA provide Canada with nuclear weapons. In 1951, an US official suggested to the head of Canada’s Defence Research Board that Canada might welcome some US nuclear bombs for its own control and use. 'As regards the possibility of bombs being stored in Canada, Dr Solandt reported that Mr Arneson had thrown out a suggestion which he might or might not have meant to be taken seriously, that the Canadian government might wish to have bombs stored in Canada for its own use.'32 Even if this offer was not serious, and whatever the details would have been, that it was apparently never explored is striking and suggests a genuine lack of interest.."
http://www.cpsa-acsp.ca/papers-2013/Urban.pdf
(The paper's basic argument summarized by its author: "Canada’s non-acquisition of an independent strategic nuclear arsenal (hereafter, nuclear weapons) presents a particularly intriguing enigma for scholars of International Relations (IR), a group who have heretofore neglected this puzzle. This is because in foregoing acquisition Canada abstained from exploiting an unprecedented opportunity to ameliorate the massive imbalance in military power that existed between it and the USA. Realist theories of IR would suggest that any rational state endowed with Canada’s capabilities and facing such a situation ought to have leapt at the opportunity that acquisition presented to reduce this imbalance. Yet, not only did acquisition not occur, it seems that it was never even considered by Canada’s primary decision-makers. Below I argue that this result can best be accounted for through the recognition of the role played by trust in the Canada-USA relationship...")